I used the clamp on my bike stand to hold the yellow blocks as I dont have a vice…works a treat.
I would invest in a set of cable cutters, make life so much easier than using a stanley, and mine were £12 from a hardware store. They look exactly the same as the pedros/park ones..Considering the amount of times you will have to trim new brake/gear cables and shorten new brake hoses, its worth it, and one of my favourite tools.