First up you will need to remove the side covers, fake tank, service covers, and then the grey trim either side of the tank. That will allow you access to the clamps that hold the carbs to the engine. Remove the airbox lid, air filter and then remove the airbox base from the carbs (squeeze it past the intake funnels). Release the choke cable, and pull the big hoses off the sub air filter by the steering head. With a long phillips head screwdriver, loosen the clamps that hold the carbs onto the inlet rubbers.
Get a pry bar and insert the end under the alloy plenum chamber, above the fuel inlet pipes, and lever up off the frame cross-member. Lever only on the plenum, don't lever on the carbs themselves. The carbs should pop off the inlets with a bit of force. Once they are loose, you can take off the throttle cable bracket (two philips screws) then the cable can be removed easily. Pull the drain hoses off the floatbowls. Remove the fuel hose and you should be free to walk off with the carbs.
Carb inlet rubbers get hard with age, and new ones don't cost much, with new ones refitting the carbs is much easier. Grease the inlet rubbers where the carbs slip in, get one side properly inserted, then line up the other side. Make sure the ramps on the inlet rubbers that guide the carbs into the second inlets are sticking out, and a bit of firm pressure on the plenum should see these slip home. I used a piece of wood placed on top of the plenum edge, and a rubber hammer, to persuade them in, but with new rubbers I can do that by hand.