From what I have read about it, you need to remove the 14th fret and drill holes down into the neck joint through the fret slot. Then the steam goes into one or both of those holes. I don't remember exactly.
Seems to me there was a thread some time back that talked about how Guild necks were the most difficult of all to steam off. Apparemtly sometimes the 14th fret was not the place where the holes needed to be drilled or something like that.
I know the steaming time is also important.
Too short and you break wood.
Too long and you cause other damage like the fretboard or top coming unglued.
Specific fret depends on the particular guitar. Yes, google it! There's lots of cool/good info on the web.
Not only is time important, but volume/pressure of steam. I use an espresso machine & have to have a manual relief valve inline so I can dial up or back on the amount of steam. Otherwise there's way too much pressure.
Yeah, I saw that page too, Chazmo. Thankfully, it's an ancient plywood guitar, so I can't really screw it up. I was going to hook a hose to my wife's pressure cooker, but it sounds like it would be too much steam pressure. :?
check out the Musical Instrument Maker's Forum (MIMF), they have extensive discussions regarding almost any aspect of musical instrument construction and/or repair.
ce