Memory wire is very hard, don't try to cut with regular flush cutters as it will destroy them. Memory wire cutters can be bought for around a fiver if you don't have anything suitable.
Instructions are simple:
1). Cut a piece of memory wire the size of your wrist plus 2 inches.
2). Choose your beads and map out your design.
3). Turn a loop at the start of your wire,
4). Slide beads onto wire.
5). When you're happy with the result turn a loop and trim off excess wire.
I attached charms to the end loops, I like the way it looks.