Wow...first bike is a sligshot, that's pretty nice! Just take your time on the trails to get the hang of the bike...shifting, carrying momentum, balance of front and rear brake, etc. The confidence will come with time in the saddle. Not sure of the build on your bike, but one thing I found nice for Michigan riding was getting a narrow handlebar. Many females have narrow shoulders so a narrower bar is more comfortable and helps getting between the tight trees!

Lets see a picture of the bike!