North of the Border
#1 Rob Lee has answered questions in this forum before. How often he comes to this forum, I don't know, but he is seen in other forums often.

#2, for regular and most dovetail joints, skew chisels are totally unnecessary. They are just nice-to-have tools. I have done numerous dovetails that were never touched by a skew chisel.

You can easily grind and shape a cheapo bench chisel into a skew chisel and save yourself a lot of toy money (for other toys). But in most cases, as I said, you wouldn't need a skew chisel.