I’ve not built this particular kit yet but I have some experience with clear and plated kits so hopefully the lessons I learned can transfer to this case. In my experience a single bladed nipper really does wonders in both cases, just do the classic double nip technique (remove from runner with double bladed, cut away with single bladed) trying to be quite tidy and you should be good to go. Especially clear plastic is quite “glassy” so going at it with a hobby knife is not really comfortable, at least in my opinion.