Anyone know of any "Synergy for Dummies" sites. I just don't get the hang of it.

1) Do I need to have high crafting skill to do it?

2) Is the Synergy say for "Genbu's Shield", do you have to have high synergy lvl?

Just can't figure out what I can do and what I can't, no one I know does it, once I figure out what I can do, I need to figure how to.