As you fit the tensioner tool it slackens the chain and allows about 10mm of lift once you take the old gasket and half moon out. Then you just fit the new halfmoon and slide in the new gasket then tighten the tensioner down and remove the lockong tool

If you google 1.8t tensioner gasket guide. You should find a couple that have done a guide. I got kine from an a3 owners club

Its a lot easier to do than it may appear
 
Can those who have actually done it confirm do you need to get TDC and mark the chain links to prevent messing up the timing or do you simply use the tensioner tool without worry?
 
I put it at TDC and marked the chain links on either side along with the sprocket, There are arrows on the bearing caps next to the chain, mark the sprocket and chanin in line with those,
there must be 16 rollers between the 2 marks,
Then you can use the special tool,
 
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No need to worry. Youre not physically moving the sprockets from the chain so its near On impossible
To knock the timing.
 
I've got to replace my rocker cover gasket soon I guess it's worth doing this at the same time!
 
Has anyone got a link to the Cam Chain Tensioner Compressor tool? Had a look but can't find one?