HELP NEEDED - How to install new chain slide?

[BM]

I need to replace the chain slide on my 990 Adv R.
Got hold of a new one and now have to do the job.
Have anyone done this before?
What do I need to strip off to replace this?

 

[Adventurer]

 

[BM]

 

[Kamanya]

 

[Adventurer]

 

[AntonW]

 

[BM]

 

[Adventurer]

 

[briv]