I need to put new bearings in my zanussi td 4212 w?

should i attempt this myself, I have found rear bearings and a drum shaft online which i can buy for under £20 . my dryer doesn't turn when switched on.. and if i force the drum round it makes a scraping noise.. a man came out today and said i need new bearings, but now i have found out how much I can get them for I am wondering if I would be able to do it myself.. help please