I don't know the idioms in the following sentences. Could someone tell me their meanings, esp the meanings in the quoted context? Thanks.
1、Understand and document those expectations, and you’re off to a good start.
What does "you’re off to a good start" mean here?
2、After we’re up and running, we could go over the telephony portions step by step.
What does "up and running" and "go over" mean in this sentence?
3、 If push comes to shove during the project Planning process, time might have to give because quality cannot.
What does "push comes to shove" mean here?
4、You’ve probably heard the old saying about the word assume, something about what it makes out of “u” and “me.”
What does "something about what it makes out of “u” and “me”".
You're off to a good start = you have started well
up and running = fully functional
go over = check
if push comes to shiove = circustances may force changes
assume = it makes an 'ass' (idiot) out of you and me.
thank you for your help 
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