Help with letter box, someones broke it off the front door

How easy are they to fit, im not that good with things like this but belive it is always better to do it yourself and learn. So is it a hard job and does anyone know the price of a letter box.

The door is a brown plastic one and the letter box is brass looking.

thanks

It should be quite a simple job mate.Best thing to do is remove you old letter box, this would normally be done by removing a few screws from the inside.You could put a bit of paper temporarily taped over the hole it leaves to keep out drafts. Take your old box with you when you go to buy a new one so you know the sizes. Once you have bought a new one it should simply be a case of screwing it back into the same void, so long as its the same size. Most letter box holes will be a standard size. As for price this all depends on what style you choose....hope this helps.