Its good to know that J2ME is relatively simple to pick up - though you may also need to learn parts of
J2EE so you can create websites to provide data or services used by your Midlets.
For me, the tough part is figuring out a compelling application. I believe that once that's done then the rest will kind of fall into place.
SCJP, SCJD, SCEA 5 "Any sufficiently analyzed magic is indistinguishable from science!" Agatha Heterodyne (Girl Genius)