u/Key-Bake6032

I am about to start testosterone in about a month. I am 20 years old and have been very into sports/fitness my whole life and am very accustomed to calculating macros for different cutting/bulking cycles, but I'm not really sure how to go about calculating them after I start testosterone.

Obviously my BMR isn't going to go up overnight. Should I slowly increase or leave it the same? I just don't want to miss out on any potential gains by under eating but I also prefer to keep a fairly lean physique.