Basically none. There are no valves, cams pushrods or anything in the head. Four bolts and it will slide off, it's just a chunk of metal with fins... then you can look. And hopefully just put it back on. Use some kind of penetrating lube, even wd40 so you don't strip the bolts, go gently. But otherwise not a big deal.
There may be a decomp valve, which could be causing a problem as well. But it'll just be connected to the head with a cable. Don't need to remove the cable it'll stay attached just fine.
If your cylinder looks good, but you have low compression. The decomp valve can be at fault. But really don't worry about that now. I'm more concerned about the cylinder bore.
I'm here all the time by the way and although I'm no genius I'll do my best to help. (edited)