I've spent an awful lot of time soaking porcelain tiles off of mesh sheets in the last few weeks. I had read many years ago that if you put some vinegar in the soaking water, it will make the tiles easier to remove, so I've been using hot water and adding cleaning vinegar (stronger than table vinegar). After the first few sheets my hands felt dry and itchy, and I didn't know whether that was from the vinegar or just the hot water, so I started wearing rubber gloves. Apparently, it was a good idea - check out how the vinegar has changed the color of the gloves....
However, I ran out of vinegar last week and guess what? Hot water alone does just as good a job. In fact, there seems to be less glue residue on the underside of the tiles.
One of the leaves is finished - I'm working in what probably seems like a random order, but some of the sections have to be fit together in a puzzle-like fashion, so if I work on one of them, it makes sense to go to the connecting bit next rather than necessarily in order. This is a part of a petal that is in shadow - I'll move on to the outer part of this petal next.
UPDATE: I was wrong. Hot water alone isn't working as well. If you let the tile sit long enough to really soak, the water cools off too much. Use the vinegar.