Can I install my new dishwasher myself?

My colleague at work says it’s really easy to do, but I’m not convinced he’s rightEvery week a Guardian Money reader submits a question, and it’s up to you to help him or her out – a selection of the best answers will appear in next Saturday’s paper.Our dishwasher has packed up after 12 years, and we’ve bought a new one for about £350. The seller wants another £50 for installation. My colleague at work says I’m mad to pay it, and that i