Yes, an amatuer can do a competent job of checkering. Most expert stock checkerers started just that way. a few took training in gunsmithing courses.
HOWEVER, it requires the infinite patience, attention to detail, tool knowledge, good technique, and eye-hand coordination of a master engraver. If you have all of these qualities, then yes, you can do it!
If you've done some intricate modeling work (airplanes, trains, wood carving, ceramics, etc), that would be a big help.
I've done enough checkering to know that good gunstocks are NOT the place to start practicing! Some gunsmith books and do-it-yourself manuals have stated that it takes dozens of hours of practice on wood scraps and hammer handles, etc to become good enough to do a riflestock. i believe it now, after screwing up a couple of good stocks. You have to FIND a gunsmith that is good at checkering. Not all 'smiths can do it.
Best of luck in your checkering!