txd: everyone i've EVER heard has said you can't have too much lube. (imagines sitting in a kiddy pool full of lube..." is this enough?" NOO!
) But, other than that, i wouldn't worry about the curve, but remember to relax!!!! no relaxation = tense muscles = anal being a pain in the ass pun intended.
so. a warm bath, soothing music, candles whatever it takes to loosen up.