I stacked 60 feet of Rohn25 for a friend before. Just 2 of us put it up in half a day with the exception of the base.
Started out with burying a 55 gallon drum, pouring concrete and shoving a section of tower in it. Rebar would have beem smarter but this was not used as its been almost 8 years and the tower was still up last I checked.
Stacked the first 30' by hand and it went real easy but the taller it got the more it shook with me trying to balance a 10' section of tower above my head so.
I made a "jin-pole" out of a 20' section of heavy pipe, and u-bolt and flat plates for clams, 3 of them. A pulley and rope were attached to the top of this pipe
The idea was to pull the top of the pipe to the top of the tower, attach the ubolts and then slide the pipe up through the ubolts untill it was 11 or 12 feet above the top of the tower.
Then we just used the rope attached to the pipe to pull the next section up, bolt the section in place and repeat all over again.
This is how big towers are stacked, with a jin pole. Its so easy they literally stack themselves.
The biggest problem I ran into was the legs of the last few sections didnt line up. I beat, banged, rocked, shook, cursed and pried to get the legs to line up but it was futile, until I took a break and thought of better.
If you have an ill fitting section that dont line up, send that section back to the ground and measure how far apart the legs are with a tape on your top section, and have your buddy on the ground bend the legs on the top to those measurements.
Or better yet, test fit all of this before you begin stacking.
Also you may need a hammer and block of wood to beat the sections together.