Here is how I used to teach it. This is a sure fire way to get the correct entry without drawing the hold. Although I still recommend drawing the hold just to get a good visual of what you are doing.
The idea behind this is to section off the heading indicator into the 3 different entry areas.
1. Fly direct to the fix. This WILL NOT work if you do not fly to the fix.
2. Determine left or right turns.
3. Place your thumb on the heading indicator next to your current heading covering approximately 30 degrees.
example: Right turn hold place thumb on the right side of your current heading on the heading indicator. Left turn hold place your thumb to the left of your current heading on the heading indicator.
4. Use this to draw an imaginary line diagonally across the heading indicator.
5. There will always be another imaginary line drawn from the top to the bottom of the heading indicator.
6. You now have sectioned off the 3 general areas to determine hold entry: Direct, parallel and teardrop. Your thumb is the 30 degree teardrop section, below the diagonal line is the direct section and the remaining 150 is the parallel section.
7. Locate your inbound leg on the heading indicator.
8. Where ever the inbound leg falls, that is your entry.
I know it may sound complicated just reading it, but trust me, I have never had a student fail hold entries after they learned this method.
PM me if you have questions. Also, try this website to test my process.
Holding Quiz