Thank you guys fo you quick replies! =)

I have my orginal plumbing (unfotunatly this type of operation is still experimental for FtMs) and I absolutly do not care if the clit increases in size, so that's antoher problem out of the way. And yeah already had a mastectomie, so unless the surgeron fucked up and there's some residual breast tissues i shld be safe when it comes to gynecomastia.
I'll run arimidex though, just to be safe.

And what do you mean by "just don't crash it completly"? Are you talking about the E2 or AI?