Those pointers might actually work.
One thing to be afraid of is air hardening. It can happen.
One way to avoid this is something I do:
I suspend the "important" part in water, leaving the portion in question above the water.
Clean the steel so it's shiny.
Use an acetelyne torch with a welding tip in a rather dark room. Watch the colors as you "paint" the heat into the steel.
Just as you go through all of the really groovy pretty colors, at about 900 degrees, the steel will turn black!
The very next color is a faint red. you want to juuuuuuuuuuuust be able to see the color of red heat coming into the steel in a dark room and STOP! Don't go hotter! If you austenize the steel, even shallow hardening steel can air harden just a little bit, but enough to still dull a good bit! So, don't get it really hot.
Let it cool, hanging in the water.
Clean it off, do it again.
And again.
And again.
Then drill.
Have a nice day!