One person job as nothing is heavy. Very likely that you will have to replace all the bolts as rust and all the heat/cool cycles have taken their toll so all the bolts will twist into two pieces.
Plan on three hours.
I did this in my concrete driveway with Blazer sitting on ground.
As far as a step by step procedure....nothing exists that I know of. Actually a rather easy job to do except for dealing with the rusted bolts.
Use new gasket(s); I think there is only one.

Be glad to help out but a bit of distance between us.

Good luck.