Trim is you friend...and a good instructor. Have you discussed this with your CFI?
What are your basic procedures for the pattern? Gotta have a game plan, right? Here's mine (your's may vary):
Assuming a Cezzna or Peeper, 1,800 rpm on downwind, trim for level flight. Abeam the touchdown point, reduce throttle to 1,200 to 1,400 rpm, give it the first notch (10*) of flaps, throttle and trim for ~400 fpm descent at 75 kts. Turn to base at 45* off touchdown point, second notch of flaps (20* in the Cezzna), trim for 70 kts, check descent rate (adjust throttle if necessary) there should be very little change of trim and throttle. Turn final, flaps to 30* on the Cezzna, flaps full on the Peeper, trim for 65 kts, check descent rate. As you approach the ground get the throttle out and start slowing, about 55 to 60 kts over the threshold is okay. Continue descent to roundout and landing. Yer butt will be about 3 feet off the ground on roll-out so try to be sure the touchdown is in the 3 to 4 foot range. Try to touchdown much higher and things get ugly.