The syringe method works well, just make sure you leave an exit hole for excess to squeeze out of.
Join a forum and first two posts are on threads 3 years old. That's classy
Delams happen, and they are a bit harder to repair correctly and nicely.
If you know of a 'good' shop to take it to- go for it, just make sure you know what kind of work they go there- or they could butcher your board.
There are a few methods- try to search on the forum, they have been talked about many times before.
1. syringe injection- yes, you got it. you need to make 2 slits- one to inject into to- the other to work the resin toward and allow air out. then weigh it down. its a pain. tip: make sure you have a good big sized syringe. a small turkey baster works.
2. cut out the delam and re fiberglass it. probably the strongest method, but much more time.
3. vacuum bag it- my fav- basically the inject method, but using a vacuum and a bag to suck the fiberglass back onto the board to dry- instead of a weight. gives it an even adhesion
4. start using your foot on duck dives... hard habit to break using the knee
Front foot deck pads!
You don't sound like you are a pro at repairs, just take it to the damn shop.