timing help???

[Demon_Crest]

'86 mustang lx 2.3L
So it turns out that my mustang decided to be nice for a change. Right when im sitting in a parking lot, having a "who's the bigger man" by revving the hell out of your ride contest, my timing decides to slip.

I know my belt is still intact for the car will still fire up and run incredibly rough.

My first question is How to do your timing? I got all the drive belts off and the timing shroud off. Im not really sure on how to do it. its like night and day compared to my soob. if anybody has any help on the subject i'd really appreciate it.