as someone else pointed out, the Doctor's regenerations seems to be atypical because they are the result of a violent 'death' - not only does Romana spend her time picking and choosing between bodies but neither her nor the Doctor seem concerned that is a dangerous or risky process - indeed it seems as risky as trying on new clothes.
I have a vague recollection of a Time Lord Spirit guide of sorts that would guide a Time Lord through a regeneration.
You mean K’anpo
* I think?
* Wonderful bit of deadpan delivery from Nicholas Courtney in that clip.