I've not officially made clothing myself but have watched my mom for years and she's taught me some. She just cuts around the pattern piece and when she gets to a notch she'll cut the fabric that way but not necessarily need to mark the fabric. If you're not comfy enough winging it like that a washable marker used for fabric would work to just draw the mirror image of the notch so you'll know where it is before you start cutting. Umm clear as mud? Cuz I need visuals, not sure how you learn :).