You just have to spend MOST of your time in the wilderness to keep your skills working right. Even still, you can function without insta camo. Don't expect to be a pk god, but if you are herald you probably aren't anyway.

My first ranger was herald I think. Most of my uncaballed rangers spend a lot of time at the Inn as well and I keep my instant camo. In fact, someone commented on one of my rangers that I spent a ton of time there.