Square taper BB upgrade advice
I would like to convert my circa 2007 Shimano Tiagra square taper triple crankset to a compact double and upgrade to a hollowtech 2 BB and crankset. I have always worked on my own bikes and have never had to resort to paying the LBS to do work for me so far. I've never tackled this before and would appreciate anyone who has, letting me know which tools I need to purchase, along with any tips which might help me. I have aquired a lot of tools over the years, but don't have a square taper BB removal tool or the tools to install the new Hollowtech BB. I guess I will also need to take some measurements of my existing BB housing to enable me to obtain the correct size BB, but not sure which measurements to take. Any help would be appreciated.