You sound a lot like me, Ripose! Thanks for the support. You bring up a good point - I need to work on setting up expectations on the front end so it doesn't get out of control. I think one of my issues is that I equate sticking up for myself with being mean - something I learned in childhood that I'm still trying to shake.
Everything went OK with the email - my "boss" actually thought I made a good choice, which I wasn't expecting. I think as long as I stay firm but keep a good attitude I might make some breakthroughs. It's a learning experience, I guess! I'm 27 but still have some growing to do
Thanks again.