well, the chord tapping can be tricky depending on the chord shape. Typically if you do some very basic chords like A, C, E, or even F, it should only take on finger to do it. Really fun but I would try to do this first:
And (17)=tapped note
e------
b-5(17)
g-6(18)
d-7(19)
a------
e------
that "Chord"(its only actually 2 notes) is easy to finger and easy to tap. You need to make sure that your finger that you are going to tap with is angled to hit those notes at the octave(17,18,19) and make it one quick hit. Once you can do that pretty well, I would say you can start to figure out how to do more complex chords(or more arpeggios) with your tapping.
Good luck, as this little technique can be quite frustrating at first.
if you want to hear an example of this and see it in action(I know you didn't want this) but youtube "Dance the night Away" by Van Halen, its a live perf. by them(With ROTH!) and you get very good looks at what Eddie is doing. The "solo" is all tapped harmonics but he also taps out the "chord"(2 note thing again) and actually changes the shape up after 1 or 2 taps of it. Very cool stuff, and study what he does for the best example of how to do it.
If you want I could get some video or pictures of me doing it to better help out the visual aid.
BTW the intro to Spanish Fly is a tapped chord(A minor), he just uses the same type of arpeggio that he did for the intro riff to Ain't Talkin' Bout Love.