Gotta say, the guys I've been working with could not have been more encouraging and supportive but staff and work demands meant I was on-site alone after 10-12 weeks so you do your best not to fall in a hole, off a ladder or into the s**t. Managed everything except my two-way lighting was wrong (new builds, no power, no damage) I can empathise with a newbie unsure of himself but surely most major issues can be avoided with a phone call.
Well done for considering your guy rather than adopting the "grow a pair" mentality.