Just in case you are not up to date on other kernel-compiling procedures, one of the best modern kernel compiling guides is
here, written by Alien Bob. A few things have changed since the old days, but nothing too major (or difficult). I would advise reading CHANGES_AND_HINTS.TXT and UPGRADE.TXT if you haven't already just to catch yourself up on new 12.1 stuff. Good luck and enjoy!