You can get the gloves from Harris Angling, but a lot of people shun them for fear you can damage fish without realising it - ie if your fingers stray too near the gill rakers and filaments.
I can see the advantage though for people unused to handling pike.
Once you get used to feeling your way up the gill opening and gripping the jaw bone, they're fairly straightforward to unhook, especially using barbless hooks.
A pike's mouth is clearly a lot bigger than any other fish and there's plenty of room to work in.
If one or more of the hooks is in the throat, you only have to pull it into view, insert forceps through the gill opening, clamp down on the shank of the hook and turn it out.
Obviously it's better not to deep hook them in the first place, but it happensd to all of us from time to time. The important thing is to do all you can to avoid it, and know how to deal with it if it does happen.