I've done the same thing about 3 times with my trainer, back in the day. I did this when I was 14, so I think you should probably be able to do it also. Take everything apart, making sure you remember exactly how it goes. Take the parts and individually rinse them in some glow fuel, dry them off, the re assemble them and put after run oil on all the moving parts while you assemble them. Just be careful, the screws on my head striped out, you need to grind down the tip of a screwdriver to make it more blunt, otherwise, with a pointed tip not enough of the screwdriver can grip the screw and it ends up stripping out. The whole thing is pretty easy to do, just remember to give it a good squirt of after run oil before you seal it back up. Have you dad sit with you also, because at first it's hard to figure out how to get the connecting rod back on the crank. When I ripped mine apart, there was lots of dirt inside, so it does it some good. Unsure if you can understand all that rambling from one thought to another, but good luck.

Alex