Good to have another mountain biker out there. The bike doesn’t make as much of a difference as to whos riding it, you can go out and blow $7k on a bike and still get smoked by somebody on a bike they got for $200 off craigslist. Take it slow at first and learn how your body and the bike work together, don’t try anything your not comfortable with. You should be okay at big creek I ride there fairly often and its not too tough some rock gardens and rooty sections on the more advanced trails but you don’t have to ride those if you don’t feel comfortable yet. If your looking for somebody to ride with let me know I live in Cumming and ride with my brother and a coworker often at Big Creek, Blankets, Chickopee, etc… Best sport on earth! Just remember, always have fun with it over time you will get better.