W126 300se Viscous Fan Bearing Bracket Replacement

[benzportland]

Really stuck here!! Gee I have read dozens of posts on this task and even got two special tools and I am still stumped I understand that I have to line up the hole in-between the two raised lines on the bearing bracket in order to lock movement, and then unscrew the fan clutch. Here's what's making me feel stupid: How do I turn the bearing to line up the hole with that slot for the locking tool? Do I have to release the belt tension so the pulley can move? Any advice would be appreciated, I've done various projects as a DIY'er but am not even close to being "accomplished." Like I say I have read lots of posts, but for some reason I have not seen an answer to this basic question, probably because it is so basic. Thanks in advance!