Basically it's practice and persistence.

One thing you can try, to get your fingers used to playing in that position is to temporarily move further up the neck. For instance, use a capo on the 3rd fret and play the C chord (which would now be an Eb) up there for awhile until you get used to it. Then a week later or whatever, move it down by one fret and so on.

(if ya think C is hard, wait till you get to the F chord :)