I love biscuits and have made many. The one thing that gets me is cutting the butter. I have used several different approaches with varying degrees of success. What works for you.  
I used to use a pastry cutter, but it was hard work and a pain in the butt clearing the blockages. So I switched to using a food processor.  It's so much quicker, and providing you cut the cold butter into 1x5cm sticks, it yields perfect results with just a few pulses. 