GT uses more vacuum hoses due to it having a vacuum petcock, but GV has a manual petcock, only worry about Front & Rear engines sending air to the fuel pump. That’s all you need to worry about.
Now, the other pipes like EGR (if present on the bike,) throw them away, the bike wont miss it , infact it will be glad as those things are parasitic (robs vacuum energy) and block the metal tiny pipes at the engine side and then block the airbox’s extra ports.
(I would doubt it , if it is a genuine 2000 engine it wont have egr ports , thats something added to later 2005+ engines to meat the silly Euro3 laws)
(UK for now doesn’t care so to speak as MOT testers don’t check emissions on carb 125 bikes. Just exhaust loudness that’s all.)
More on that here:
How to change Vacuum Lines on Hyosung GT125R GT250R & GT Comet (Air Hose Diagram)
For fuel (liquids) , here is a specific tutorial , follow it exactly.
How to change / upgrade fuel lines & fuel filter on CARBY GV125 & GV250 Diagram
The Carb Float BOWLS = Have extra hoses on them that are basically overflow & drain ==== guide them down towards the road. (if you have V1 carbs)
If you have v2 carbs their overfow & drain pipes will be both on top of carb and bottom of carb ==> guide them down to the road.
If still stuck , post some pictures so we can where you get stuck.
Good luck!