The passé composé is definitely something to be learned in steps. The formation of it, the verbs with avoir, the verbs with être, the reflexive vers, the agreements. It all takes time but lots of practice makes it easier. First you can go to Tex’s site and do the verbs with avoir. You can then do the verbs with être or you can go here. There is a slideshow here which explains all the details…in French! CliffsNotes gives you a very clear overview to consult at any time. Bonne continuation!