I am a pretty active hobby builder…I have done maybe 20+ rods now. I am currently working on 4 different Sages but I also have built up some lamiglas rods that are great.
In terms of components, I think Sages are worth every penny in terms of the fishing experience and the long term value. My first build was a 3113mb and I learned a lot from it. First thing was to shape your corks slowly, that’s one stage you can't easily undo! The cork work on that first rod is OK but subsequent rods turned out much better. I use a taped up drill bit in the butt of the rod and a roller one the blank to create a lathe! I usually masking tape up any area that I want to protect from scratches (rod blank area that sits on the rollers, reel seat, etc).
After the cork is on and turned down, lashing guides are the next stage. My first wrapping station was 2x4 blocks with casters epoxied to them to create rollers and I used a telephone book laid over the thread as a tensioner. You certainly don’t need a fancy system here but the flexcoat wrapping stations are pretty next and pretty cheap too. Use some 20lb braided loops to pull your thread.
The final stage - epoxying the wraps...this is another critical stage. Use syringes to measure your epoxy. You mess that up and you have a sticky mess that is a pain to undue and will ultimately require you to rewrap the rod. I have never had an epoxy issue (i.e. in the setting) but I measure 3 times! Now epoxy can take a while to set so a good turner is important...I borrowed a cheap turner from a friend and the chuck allowed the blank to slip out. Fortunately I caught it pretty quick and also late in the drying phase but that could have been a redo as well.
Rod building is really not that hard. Take your time and you will be able to turn out a really nice rod the first crack. CP’s suggestion of doing a class is a good one, especially if you just want to do one rod…you won’t have to amass all the different tools, buy bottles of epoxy you may one use once, etc.
Good luck.