So, we don't have any pictures yet?
I use the flash with white card attached with a rubberband. I only use a diffuser for close up shots outdoors these day. Too harsh otherwise. Every bride's had blue eyes and I can't deal with the pp later stuff for that.
But the 50 1.8 is not the world's worst lens, just really not the best. Still think for weddings, even if it's just for family and a favor, etc., etc., the better the gear, the less work later. But you still have to do your homework and practice. I messed up on the exposure of my son's winning piano recital and didn't chimp for when the lights were turned on and overexposed his pictures. I finally took moment to check and sure enough, every one of his 5 shots was overexposed. Corrected it and kept on shooting. Makes a world of difference using the right lenses and flashes. The 430 with Energizer rechargeables are not a bad combo. I use that on my 40D almost all the time indoors.