If you have to ask, it's probably a bad sign. These things aren't difficult, however.

Pedals are easy. One tip: one of your pedals is reverse-threaded (I think it's the right one). Your pedals will use a 15mm wrench - if you are lucky, you'll be able to fit a regular Craftsman-type open end wrench on it; if not, you'll need a thin pedal wrench or use an allen wrench.

The rack and fenders may require a trip to your hardware store. If you're mechanically savvy, you may end up improvising a bit for a secure solution. Also not hard, but some creativity may be required.