The hardest part is the headlight switch. Find a small nail and bend it to a 90 degree angle so it'll slip into the hole nearest you then push towards the hood of the car. The rest is straight forward just make sure you reach around the cluster and unplug the connections for electric. Here's another set of instructions, this is for an overlay of the gauges. http://www.mustangworld.com/speedshop/gauges/gauges1.htm
dude just take out all the screws and the middle cluster part comes out last. stick a screwdriver in the side for the headlight switch. so easy a caveman could do it!