We've had to help shrink-wrapped chickies before, but more often than not they pop the rest of the way out during the night with no problem. If it hasn't been a day (or at least over night), I would keep an eye on it and wait.
For incubating and hatching, a humidity gauge can be a huge help. They're pretty inexpensive (the cheap analog ones are about 5 bucks), and you can find them in most pet stores that have a small reptile section, so I recommend one of those too.