1. Don't follow the conventional wisdom on RSI
I struggled with RSI for years, and did all the usual things (warmups, exercises, braces, a Kinesis with modified key layout, etc.) Then, in early 2010, I read (at Aaron Iba's suggestion) The Mindbody Prescription by John Sarno. Within a couple of days, I saw remarkable improvement; within a month, I was symptom-free. YMMV, of course. 2. Don't wear a brace of any kind.
I question the advice to wear a back brace. Over time, this leads to muscle atrophy and causes or exacerbates the very problem you're trying to solve.I don't warm up, don't wear braces, and have switched back to a Qwerty layout. I stay strong and healthy other ways, but I now ignore all RSI-related advice that doesn't acknowledge the "mindbody" nature of the problem. I've been symptom-free for more than a year. (This is an anecdote, so take it for what it's worth. The book's like $12, though, so you don't have much to lose.)