First thing: take pics as you go along.
Then have
a piece of paper to write things down.
They used 2 different carbs, figure out the one you have, model# serial# of the motor??
Then the air screw(top of the carb) slowly turn it in and remember the turns in(write it down) then remove.
Take pics as you take it apart, Keep the parts organized as you remove them.
IF???? there's a lot of crud in the float bowl then you'll need to remove the welch plugs #1 and #2 (might be as many as 6 plugs)
Myself the only one I'd remove is #1 the rest can be a PITA to remove/replace.
Maybe a carb rebuild shop? tell them you want the old parts back.
That way you know if they removed the small plugs?
Do not remove the seat, it can result in non repairable damage??
Completely disassembled, then use a spray cleaner.
The soaks can destroy any rubber/plastic left in the carb.