ain't no big deal - a small flat/oval rasp, abrasive cloth and papers from 60 through 600 or 1200 grit, lots of elbow grease. it's important to go through all the different file and grit stages, in order to eliminate any toothing or abrasive marks.
sometimes it's good to stain or flame the raw wood before applying a finish, to bring out the grain.
i usually seal the wood with a wiped on coat of quality thin cya, or do a 'massey finish' (epoxy thinned with acetone), then the final clear coats which are usually min wax wipe on gloss polyu.