Another consideration is your attitude.
If you understand mechanical troubles are possible and you're comfortable dealing with them then when or if something comes up you can remain calm, collected, and have some fun solving the problem.
Don't think of it as a breakdown, instead a problem solving opportunity to test your knowledge, skills, speed dial, and friends.
Stuff might happen, plan to have fun with that too. Realize one day you might not get where you want to go as quickly.
