You can run a sod cutter but make sure the soil is moist.
18" Sod Cutting about 500 Sf/ Hour.
Tilling with a walk behind about 1200 sf / hour
Then add the loading and hauling cost.
Are you adding any amendments?
I would add about 3 inches of high quality ammendments and till to a depth of 6 inches.
Sounds like you will have more in equipment rentals than you will in actual work. Rent Sod Cutter for 1/2 day take it back and rent the tiller for 1/2 day. Don't for get your rental cost.