Don't be too afraid of the engine quitting. When I was learning, some of my best landings were deadstick. Really.
It is a good idea to get a little help with the engine, though they really aren't hard to get running right most of the time. Judging by the number of guys in the LHS getting their car engines tuned for them by the store experts, I'm not sure the same is true for car engines

. (never had a car, so I wouldn't know if it would help or not).