Schumann - Opp 92 and 134 for piano/orchestra - need info

[alextryan]

I've been searching and searching for a piano/orchestra piece to play next semester, but I'm in med school and can't commit myself to a full concerto.

These two pieces came to my attention (played by Perahia):

Introduction and Allegro Appassionato for Piano and Orchestra, Op. 92
Introduction and Allegro Concertante for Piano and Orchestra, Op. 134

I don't know anything about them.  My key questions are:

1) Are they playable by an amateur?
2) Are they complete, or is there more to them? 

Thanks!  -Alex