I'm fairly new to riding and decided to go to a local guy who works out of his garage for a "basic" fit. The numbers he came up with show I have long legs, but a short torso. As a result I need a 55cm frame and no amount of "adjusting" will get my current 58cm frame to work. The adjustments now show i'm 20cm too short for the length of my bike. Even adjusting the stem and seat I would still be around 10cm out of perfect fit with my current frame now and will eventually have back problems. However with a 56cm and small stem and seat pushed up I would be fine.

So we discussed options and since I paid next to nothing for my current bike the best plan is to keep my dura ace / ultegra parts and just get a new smaller frame.

Is this something a newbie can pull off with little mechanical experience and a guide / book? Or would it be worth it to pay the $100 for a part swaps by a mechanic.

I already have the 2 below tool kits I picked up so I think I would already have all the parts I would need, but not sure as to the difficulty level in trying to DIY this project my self.

Spin Doctor Essential Tool Kit

Spin Doctor Team 33 Tool Kit