It sounds very straightforward in principal and no doubt it is when you know what you're doing but I want to sound a word of caution here. When I bought my first house, it was an old cottage with no connection for a washing machine, so I bought a self-bore kit from the DIY store and decided to plumb it in myself. It was only afterwards when I went to test it out that I discovered that I had plumbed it into the mains gas pipe instead of the hot water pipe... So just be careful before you ditch the plumber for all those DIY jobs.