I'm doing a GTP rather than PGCE (so more in school training based than a PGCE - I am still affiliated with a University College though). This suited me better as I get a training salary and no tuition fees, and was fortunate enough to get a place this way. Its changing next year though - look up Schools Direct as that has the info for next year - if your teaching a in demand subject you can get a bursary for the PGCE route or you can get training salary. Now is the time to apply...
No prior teaching experience, but once I know I wanted to teach I got myself a weeks work experience with a local school to boost my application (I also linked my application to the training of adults within IT I had done).
Behaviour management is very much a part of it, you are managing behaviour to get the best out of a class of 30 pupils...as for variety - every day if different - I am just starting and mainly teaching key stage 3 (Y7 and Y8 at the minute) - but I still find every lesson interesting - teaching the older ones and eventually A Level will only broaden my interest.