Take the time you need!

This is so important, it can’t be mentioned enough. Same as with the tip about learning to say no. Once you have said yes to a project you need to make sure that you take the time needed to do the best you can do. Handing over a project that is half done will not only give you a client who won’t come back, but it can give you a bad reputation. Your clients are your best references to show in the future and no one want a freelancer who leaves the work half-finished.