When I do it I use jack stands and wood blocks to level the frame and a floor jack and block of wood to rotate the transaxle around and push it into the frame and lower the frame down to the right height. Cautiously (as to not harm the threads) use a screw driver or an alignment punch to get the first hole on each side lined up for the first bolt and its a 15 minute job to get the rear back in. Getting the linkages adjusted out and all the pins back in was the longest part as I remember. 1 hour isn't bad at all. Dad was helping me as much as he could with a broken foot at the time so I had extra hands. I can't remember if it was really that much help. If I had to do it tomorrow I'd probably borrow Dad's cherry picker hoist to level the frame since its a little more adjustable than blocks of wood.
Glad to hear you and your son are having fun with the old girl!
This picture is from over a decade ago when I did the one on my 149, but you can see the required hardware. $99 Craftsman jack and stands combo.
(man this is bringing back memories... I haven't wrenched out of Grandpa's old shop in the pic in a LONG time... Back then this was still Dad's cub!)
