Accurate audio cutting

I ask you, guys, how to implement an accurate cut to an audio segment in Cubase:
a) Put an edit point around a zone in a audio segment where I will place an accurate cut
b) Listen 5 seconds of music until the edit point
c) With some keystroke from the computer keyboard I want to move the edit point back and forward with a fixed time chosen by myself(until to 5 milliseconds)
d) Listened anche choosen the exact position of the edit point, with a keystroke from the computer keyboard make the cut.

Please can you explain in details these passages? Thanks a lot!!