rocker arm

Evening all! As you (may or may not) know i have an intermittant misfire on my 1.4 16v (AUA) A2. This has got progressively worse and is looking more like a knackered hydraulic lifter or rocker arm (very tappety at tickover; this is when it starts misfiring) on cylinder 1. It could also be a...

I seem to have a bit of a noisy tappet (or two) which I'm going to replace. I've browsed this forum and cannot find any instructions as to how to do the procedure, instead just lots of people having it done by a garage/dealer/friend etc. Having looked at the parts diagrams on VAGCAT...