Watch as I replace the carb on this Kohler single cylinder Command Vertical 460 cc engine that powers a John Deere Lt 160 lawn tractor. It seems to be overfilling which usually means a problem in the needle and seat. To make sure I squash it in one try I'm replacing the whole carb with a cheap aftermarket replacement.
If you're replacing a carburetor you can have a dealer look it up but they usually will only sell OEM carbs which might be out of the budget for an older mower. You can look up the engine information yourself and get a much cheaper option of replacing the carb with an aftermarket replacement.
I'd say it's a good DIY job and only requires basic hand tools.

Amazon links to products I use and recommend
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Digital Battery tester
https://www.amazon.com/Schumacher-BT1...


High energy ignition tester
https://www.amazon.com/dp/B003V5ITJA?...
Vampliers
https://www.amazon.com/VAMPLIERS-Pate...
Carb cleaner
https://www.amazon.com/Gumout-8000022...
Carb dip
https://www.amazon.com/Berryman-Produ...
Tireject tire sealant
https://www.amazon.com/Lawn-Mower-Tir...
Evaporust rust remover
https://www.amazon.com/Evapo-Rust-Ori...
lock n lube grease gun nozzle
https://www.amazon.com/LockNLube-fitt...
Fluid film rust preventative- lanolin based and awesome!!
https://www.amazon.com/Fluid-Lubrican...
NOCO jump starter
https://www.amazon.com/NOCO-GB70-Ultr...