I replaced the heating element in an oven, the switch assembly in an integrated dishwasher, door latch on another, igniter on an old gas hob, valve on a washing machine. I think that's it, mostly not my appliances thankfully, just friends / family know I'll give it a go.
Yeah, other than the valve all just involved a few screws and plugging out/ in the connector lead for the switch assamblies. The valve is a little more complicated, but still easy DIY.