Managing growth can be extreemly difficult. I agree - pick a niche that you love, charge a price that attracts the kind of business you want, get help you can count on when you get overwhelmed!

I had the "too much work" problem early on. I did great work for a client and he referred me to EVERYONE he knew and it was too much. Now I have a network of folks I can pass work on to when I get too much or if something comes in that I don't have the skill set to comeplete well. That said, I ALWAY tell a prospect if I am going to farm something out and often I test the waters for the project first before passisng it on.

Good luck!