I'm new to clipless recently, too. They help me a lot on the nasty climbs. When I start getting really ragged and tired, I start doing arc drills: I concentrate on applying pedaling force at different and distinct parts of the pedaling arc. This always seems to help me forget my pain and keep on cranking.
So far, I've taken two falls - one with witnesses; one without.

(Hey! I guess I don't have to count the second one!)
Enjoy!
Good riding,
desmobob