Congrats on the lil one.
You can check the manual, but I don't think the 99 was equipped with the latch system. I know my 98 doesn't have it and I'm not sure if any 1st gens were equipped. The system does make it super easy (have it in other cars), but I feel the belts are just as reliable/safe. IMO, the seat is going to make more of a difference than the attachment system provided it's installed correctly. If you are having a tough time there are places in every area (many fire stations for example) that can provide help with installing the seat correctly.