see if you can get little farther up the hill every other week. Sometimes the gain maybe as short as 10 feet. But that's okay. And practice on gentler hill too. They do make a difference in your conditioning. And do hill repeats on gentler hill. This helps with stamina and also help with strength training for the hills.

Doing strength training on super steep hills or something beyond your ability is total waste of time, not to mention setting yourself for injury.

Most important thing is to have fun riding. And good luck.