hmmm, yeah. It is one of the simplest jobs and anyone can do it..in the same sense as most other jobs. To do it well? Pahhhhh! Really competent waiters/staff in the UK make up a TINY minority of serving staff in this country.
Don't rush around, don't take more than you are comfortable with - it's much easier on you and much more poffesional. If you get anything wrong, apologise profusely and smile! Waiters carrying 10 plates and running around is like something out of american movies - and certainly not reality. 3 plates is the max i'd ever go with and I've been doing it for 10+ years, not because I can't but because there is no point.
Ahh, just re-read your post. Big events are SO much easier. People pretty much ignore you and any waiting etiquette can go right out the window. Still hard work but a much more forgiving enviromnent.