Look at the stickies on the top of the Shop Talk page. there is a lot of good info on HT in them.
1084 is the eutectiod steel, and has the simplest HT of all steels. You just have to heat it to around 1450-1500F and then quench in canola oil to get a good blade. After the quench, you have to temper it in the kitchen oven at 400-450F for two hours, twice. The heat source can be a torch , a forge, or a HT oven. 1084 is pretty bullet-proof as far as HT goes. Use a magnet to get an idea of how hot the steel is.
Here is a prior post I made on the same question:
Here is a basic HT regimen for 1084:
1084 HT:
refine grain and normalize -
heat to 1500F ( medium red) and air cool to black, then quench to cool
heat to 1350F ( just non-magnetic) and air cool to black, then quench to cool
heat to 1200F ( still magnetic) and air cool to black, quench to cool
Straighten any warp or twist
Austenitize-
heat to 1500F ( just a bit redder than non-magnetic) and hold long enough to allow the blade to be evenly heated.
Quench in a fast quenchant (or as fast as you have, canola will work for all but biggest blades)
Check for warp after holding in the quench oil for 5-8 seconds. Straighten immediately. Stop after about 20-30 seconds, as the blade will be too cool and may break.
Temper immediately at 450F for two hours, twice. Quench in water to cool between temper cycles.
( If there is any warp after the blade cools, it can usually be straightened while at tempering temperature. Let it heat for 30 minutes before any straightening.)
You can always use the report button to ask for a move to avoid duplicate threads.