Typically one of the largest, most time consuming element of a web project is actually working with a client. It would be so simple if we made all the decisions, but we don't. Guiding a client through the entire process helps to create a better working relationship, a more streamlined & efficient process, and better end results.

Let's start at the beginning.

Starting a project with a positive attitude is the biggest thing; it sets the tone for the entire project and means that down the road when you run into snags the client is more likely to trust you and work with you to get past them. Let's also make it clear that the beginning isn't when the project starts - it's when you first make contact, through the proposal process, and into the actual start of work.

The biggest part of this is the proposal. Clients' typically don't know what to expect when it comes to cost, so during needs-assessment it's always a good idea to make clear that you are knowledgeable, experienced, and give them complete faith that you will provide them with the best possible solution. Be willing to negotiate price - like I mentioned clients' rarely know what a website costs and may expect a much lower figure than you present to them so be prepared to move things around and work with the client. It also helps to be open about the cost, go into detail, and explain the complete rationale behind your estimate; not just what they're getting for their money, but what it takes you to get them there.

Clients start out wanting a Lamborghini with a Hyundai budget. Find a middle-ground (somewhere around a Nissan) where they know they will be getting something reliable, with decent options and a good maintenance plan.

Maintaining the trust.

After a business relationship has been established it is (just as in any type of relationship) imperative to maintain a level of trust between both parties. This means that clients should - send deposits, hosting fees, and anything else required in a timely fashion, and in turn you should provide concepts, feedback, and other deliverables in accordance with the timeline of the project. This is pretty obvious stuff, yet it often breaks down causing tension.

Keep things moving - communicate.

The simplest way to maintain trust is to be proactive. If you respond to emails and calls quickly, deal with issues that arise and keep a positive attitude you will avoid things falling off the radar or losing importance and your client will reciprocate.

I've seen many projects turn into disasters because of poor communication. The client is paying you, and you need to take on the responsibility of keeping the ball rolling. Don't wait for a response if it's been several days; call the client and make sure they received your email or voicemail, and show them that you care about the project.

Wrap it up nicely.

The end is the beginning. Just like you've always been told not to burn bridges, the better metaphor would be to cross the bridge then make sure your client follows. The end of a project can be the most painful, you're both ready to wrap things up but you keep getting change requests. Build this time into your initial quote, make sure you're available - i.e. don't schedule another project to start the same day you schedule one to finish. Making yourself available until (and for some time after) you invoice a job shows that you care.

Time is money and just like sharks, if we stop moving forward we fall to the bottom, so it's alright to be on several projects at once, just make sure you are giving all of your clients the attention they deserve.

This is all common sense.

I read a lot of articles on this exact same thing, most often sending the same general message, but it never seems to sink in for a lot of designers and developers. Letting frustration, minor scope-creep, and demanding clients develop into a negative attitude leads to more frustration, scope creep and even more demanding clients.

If you find yourself in a situation where you're feeling frustrated or overwhelmed DON'T CONTACT YOUR CLIENT. Take a step back and approach every communication you have with  a positive theme. Be honest and upfront, bite off a little scope creep but if you need to do so - inform the client that you need to reevaluate the project components and work with them to reach an agreement. Work FOR your client and give them 100% (and more) and you will not only maintain a client, but more than likely gain new ones.