As AK said, the black downs arent really blacks at all, you can easily roll 98% of it at 2MPH. The bits you cant, you can stop before you go over them, so no commitment required at all. The black bits are definitely black for their ups rather than downs, after 2 days of riding my legs were nicely warmed up and this killed them! Even AK had to put some effort in which is saying something! A novice can easily roll nearly all of it, just scope if out before you got hitting it at any speed. Lips are all pretty mellow, so even if you do over-egg it then theres no real harm going to be done.