Yes, plenty of us have butchered birds!
Cornish cross: fast weight gain-best feed to muscle conversion. Not really a candidate for free ranging. Butcher at 6-8 weeks. Most similar to grocery store chicken.
Rangers: breed for meat and free range/more natural chicken behavior. Longer time to process weight. Usually 14-16 weeks or so (depends on raising environment/free ranging, desired size).
Dual purpose: males for meat, girls for eggs. Process 14-16 weeks or longer for decent carcass. Not sure how these compare to Rangers bc I have never butchered a Ranger. Traditional choices here are New Hampshire’s or White Rocks. Also, Jersey Giants were bred as a table bird, and Dorkings are meaty, with some more dark meat/meaty thighs and legs. But, many breeds are acceptable here. Generally any hybrid layer Or Mediterranean breed is a poor choice for decent carcass as they tend to be lean.