The most important thing to do is to point the bows directly into the wind. Most of the time if your bows are straight into the wind, all you need to do is pull the sail all the way to the top and then ease the halyard and the ring will drop right onto the hook. If the wind is coming at an angle to the bow by even 20 degrees, it will blow the sail off to the side which can make it hard to hook.
Otherwise, read the FAQ and do a search, this has been discussed a thousand times already.
We have the older 18 comptip, we have a new one we still need to install. Also, when we pull the sail up, once it gets to the comptip, it gets super difficult to pull.
Not too sure what you mean by older comptip. There's only ever been one style of comptip for the 18. The only change they ever made was to add a short length of aluminum track at the top of the mast to keep the bolt rope from pulling out.
If you have trouble hoisting, make sure the track and bolt rope are clean. Also make sure the track is smooth where it transitions from aluminum to plastic. Look for deformation of the plastic track where it might be pinched from someone tieing it to their trailer too tight. Make sure your halyard sheaves aren't worn, and spray a little silicone in the track. Always worked for me.