LT28 Fuel Starvation

Ok, so tomorrow I'm determined to solve my power loss going up hil

I know there is water in the tank, and probably some crud as it's been standing for several months etc

I have bought 2 new inline filters and I have some carb cleaner

I've put in a bottle of Wynns Dry Fuel and emptied half a can in through top of open carb, slight improvement but probably just my imagination.

I think I should remove the carb and clean it out properly, is it easy? can i easily lose or drop stuff when i take it off, just a few bolts? then in my shed and strip it? Peirberg removed years ago and a new Weber put in place, only a few thousand miles done since

Then I'll change both inline filters

Should I remove the tank? and if so how to clean it out? could the pump be knackered or blocked? filter?

Anything else to check??

Many Thanks in advance

Stewart