This information is really outdated, as everybody should have upgraded to EasyMiNT and Sparemint by now.
This is a nobrainer, the only thing you have to do (assuming that you've already installed TAF of course!) is to edit a few lines in MINT.CNF. This will disable X-Windows and start N.AES instead.
GEM=c:\n_aes\n_aes.sysIf you know that you won't be using X-Windows anymore (it's pretty useless anyway), you can safely delete all X-related directories on the MinixFS-partition (they're all called X or X11).
Read more about the TAF-kit at Toronto Atari Federation's web-site.