So the PHB has NO rules for using skills, as far as I can tell.
There is a one sentence description for all skills and the rules for the hide, search, influence and study actions. I've heard this is because players never initiate skills; they either take an action that uses a skill or the DM calls for a skill test. For example, a PC doesn't declare they are making a perception check to look for something. They can take the search action and the DM says the skill that is relevant. Likewise, a player doesn't declare he is making an open locks roll, the player says he's going to pick the lock and the DM tells them what skill to roll.
Honestly, I can see both sides of this. On the one hand, a lot of players declare what they want to roll vs what they want to do and the DM decides what is the appropriate roll. On the other hand, it would be nice to know what a skill can actually do. I wager it won't matter as the minute the DMG is readable, everyone is going to be reading it and know what the skills do anyway.
But these months in between are going to be agony.