Good advice for most guys nowadays.

Like everything nowadays, ever little warning possibility has to be spelled out in excruciating detail.

But really good advice would be:
Don't do anything that scares you.
Don't do anything that you don't understand.
Don't do anything that you know can hurt you.

A number of the guys at my favorite field hand start their engines. I fly there because it's the only field in the area where there are that many good flyers and experienced flyers. It's comfortable to fly with good guys. It's my hobby and I like the comfortable feeling. There are fewer guys there that scare me than are at the other fields. Most use starters but can and will hand start when they feel it's called for or saves walking back for the starter.

None of them will hand start an engine mounting a thin, composite prop.
Not a one of them flip APC's for example.
A couple of them have gloves they use.
Every one of them has a list of engines they will hand start and a list they would never hand start. The list isn't by generic type or size. It's a list where each item on the list is down to THE engine itself. Like, "the ST60 I bought in 1983."
Every one of them is experienced enough to know how to do what they want to do and how to do it safely.

Nowadays, there aren't too many left like them. Best advice nowadays is that if you're not sure of anything, don't do anything.

OK, listed enough don'ts for todays lamers?