VIDEO - How to fit a radiator
Here's a video that shows you exactly how to fit a radiator, including a list of tools.
It's a step by step process that's easy to follow. Most radiators are fitted this way so it's not difficult, just take your time and make sure you have everything to hand before you begin.
Oh, and remember to check whether you should turn your heating off or not, I always do it just in case. Good luck. Now, think about how you can spend all that money you've saved.
Have fun, and stay warm!