Hi, the first thing you should do if possible is identify the tree properly so you can take proper care of it - lots of non-bonsai people call anything that's evergreen with needles 'pine trees', when they are in fact looking at spruce, fir, hemlock, larch (none of these are very likely in Hawaii, but you know what I mean) and there are lots of diff. pines too. As far as the moss goes, you'd be better off asking a local nursery what to do about it because they'll have something to take it off with. As for pruning, go to www.evergreengardenworks.com and look under Articles. There are v. good, basic answers there. Maybe the best thing you could do (and get lots of help from it) would be to contact a local bonsai club or society and get their advice, because they'd be most familiar with local trees, and if you can maybe show them a picture of your tree, could give you info. on what it is, and how to take care of it (prune, etc.).