Driving Lesson

Tomorrow i have a lesson on driving with Mr. Bob or his son, Joel. Either way, i might have to driving in the snow. I haven't seen snow before and i've seen cars slide on the ice; moreover, i am terrified that i will slide and not know what to do, except panic. I've already broken the back window on my dads old van (8)and accidentally drive on someones lawn(15). What am i doing to do when i actually crash when learning to drive!? Well, i guess i need to know when to relax.