I have been climbing 25 G towers for at least 50 years for ham and work, some 25 G towers over 100 feet. I have size 12 shoes and the climbing is not difficult at all, although it can be challenging to find a comfortable work position since squeezing in two feet is difficult or impossible and cramps can get annoying at times. One easy solution is to install a standing platform at your usual work location. I believe Rohn makes one and it would be much less expensive than a 45 G tower. Another untried idea is to bolt some angle iron cross pieces at work locations, like near the antenna, rotator, etc. I have never done either fix on my 25 G towers at home, I just climb down if it gets uncomfortable to do extensive work and finish it later in the day or the next day. For sure if I wanted to install a tall tower with big array, and money was not a major factor, then I would choose 45 G. A section of 25 G is not too heavy, and easy to stack with a homemade, or ROHN gin pole, or even two relatively strong experienced antenna guys who can just lift and stack each section. I am not recommending the last option which could be dangerous and I no longer do it this way since I am 78 years old. If you are going to climb invest in a new fall arrest harness and hopefully get some training from someone with experience. The old waist belt is a poor choice, so a real harness with all the stuff is well worth probably at least the $200 cost. Perhaps you can try some climbing on a 25 G tower, even one section at a ham dealer. With a gin pole, it is easy for me at the top of the tower to have two assistants on the ground just pull up a section of the tower at a time for me to stack. If you put up 20 feet of tower and guy it, you can then stack additional sections, but by the time you get 20 or 30 feet above the guy wires, it feels rather strange as you stack sections, so not all folks are comfortable with the slight back and forth movement until you get the top guy wires fastened. Not dangerous, but just the skinny tower and slight swaying may make some of your antenna helpers want to bail out. Stay safe and do not do it if it does not feel right. Not everyone should climb. For a moderate to large size antenna, most folks like to place the rotator at least several feet below the top of the tower, with a thrust bearing at the top. Make sure your rotator can be installed inside your 25G tower, hopefully without removing any cross bracing. I opted for a Prosystel rotator from Array Solutions. It was powerful enough and I could fit it in between the cross bracing of my 25G. It was rather expensive, but has worked flawlessly for me for about 15 years so far. If your Yagi is small like a trap tri bander, or spider beam, possibly you can get by with your rotator mounted at the top of your tower. Do your research. A rotator rated at two or more times your expected wind load is probably not at all an over kill. Rick KL7CW Palmer, Alaska where the wind is often strong !