3.0 V6 Petrol Head Gasket Process and Tools

[jullio]

I am looking to replace the head gasket on both banks on my A4 3.0 Quattro 2004 with 90k miles and wondered if anybody had done this before and can offer any wisdom. So for example, there seems to be several cam locking tools available at cheap to expensive prices circa £60 to £260, is there a importance difference to note? Also wonderng if doing this repair may not have good longevity as it's not an easy not cheap process.

Many thanks in advance,

Chris