Wheel and inner guard off.
I just did mine the other week, didn't replace entire tensioners, just removed and replaced pulley wheels.
Alt pulley I used Dayco EP025 (65mm), Air con pulley was Dayco 89147 (70mm) could be other way around, 1 was 70 and one 65
Belts are 5PK0850 and 5PK0890.
No need to remove alternator, remove tension T50 and 13mm socket and swap belts.
Coolant tanks are good idea as they crack and car does not have low coolant level sensor. All hoses are normally ok, but check the upper radiator hose, it's a nightmare of a think with several plastic tee piece joins.