I've got a rattle.

[10G]

Had mine off just the other day. Been through this a few times & this is the way I do it.

Tools - 12mm, 17mm & 19mm sockets. Driver & extension handle (bit of Pipe)

Crawl under front of vehicle. Unclip small section of radiator shroud at the bottom (straight piece around 50mm wide) & remove.
Place 19mm socket on driver with extension handle on the lug nut on tensioner. Apply pressure towards passenger side of vehicle.
With tension off the belt slide it off the Aircon Pully & remove.
Remove top bolt (12mm). Remove bottom bolt (17mm). Remove tensioner.

Reverse the process to fit new tensioner & fit belt.

Great thanks VK2FMIA that sounds not too hard, I might give it a go myself. Thanks for the useful write up.