As far as I know, great special tools are not needed ... just tools and not toys!
Problems can always arise during disassembly ... rusted or tightly fitting screws, defective hoses that you will only discover later, etc. ... if you have the right replacement, the replacement shouldn't be a big problem ... same problems are possible with a used replacement like the old one. In particular, you should pay attention to the flexible pipe in the downpipe ... they like hops with such actions and repair or replacement is difficult.
