I don't know about the skill, but as the years go by I acquire more bravery for this sort of thing, and more patience. Having the good sense to walk away before doing something you suspect may be daft, thinking it through (and in my case phoning a friend!), is something I would not have had 5-10 years ago.
The bravery also comes in part from living in the middle of nowhere and knowing that this is allegedly one of the simplest tasks and should take a competent mechanic 20 minutes or so, not wanting to submit to the dreaded transporter. It took me half a day! (My e-type did in fact leave on a transporter because having replaced the fuel pump, it still wouldn't start and I wouldn't know which way round to hold a distributor or spark plug)
Here's hoping there is no more bravery required between now and FLED 6. Had her out for a 40 mile test drive today and she behaved impeccably, and looked marvellous thanks to some care for the paintwork and interior from me and she-who-must-be-obeyed in between head-scratching over slave cylinders etc.
Ferraris : 1990 Testarossa, 2000 550 Maranello
Others : 1967 E-Type S1 FHC, 1972 S1 XJ6, 1972 Maserati Ghibli SS, 2006 Ford GT, 2001 Mini Cooper Sport 465/500
Past : 1980 512BB, 1994 348 spider, 1989 300 SL, TVR Griffith, TVR Tuscan, Lotus Elise, 996 Turbo, Cayenne GTS