i've quit cutting for four years and i never looked ahead and i still don't. i know this sounds very cliche but take each day at a time.
the coping mechanisms you're using that are working well use them. of course there is going to be times where the urges are more intense than others. when you get those you're probably thinking the coping mechanism you're using aren't working as good as they used to. but they are. it's takes a bit more strength to keep yourself from hurting when you get those big urges. i swear to you though, each day you hold back it gets easier. i don't know about you, but when i had those intense urges and i held back i was so proud of myself that i was able to do somethign that i thought i couldn't.
one thing i really want to say about the small slip. CONGRATS FOR NOT LETTING IT DETER YOU FROM YOUR GOAL! that state of mind you have right there is what you need to quit and i truly believe you'll quit. no doubt about it!
when you get those urges.. go ahead and scream, cry, talk to yourself, just let out all the feelings you're feeling. you know, make yourself LOOK like a crazy person

cause i know i sure did!! when i had intense urges i'd get tons of blank paper and use a knife or razor and slice them to pieces with all the anger i was feeling. i was still cutting but i wasn't cutting myself. one thing i think everyone should do when they're trying to quit and are having urges is to do something. don't sit there and allow yourself to think because all that does is make the urge worse.
good luck.
Elizabeth