can I highly reccomend a copy of the cosworth manual, I got mine from woodford garage motorsport for a very reasonable £50, tells you everything you need to know as with all bolts/nuts in a engine, you should tighten them using a good torque wrench, and in a sequence so you are working from the middle out, doing each bolt up in order a bit, until final torque is reached
DIY is a good way to learn all about your car, just don't be afraid to ask questions or stop if you dont know what you are doing