I converted from heel to forefoot strike years ago. I find it almost impossible to run in normal 10mm heel-to-toe drop shoes now. Most of my shoes are 4mm drop. I tried the 0mm drop. It was too much for me.
One tool to help with the transition is to do several strides barefoot on a football/soccer field. It's almost impossible to heel strike when barefoot. Once you get the feel of the barefoot strike, immediately put on your shoes and attempt to recreate that feel on the track.
It's best to do this for only 20 seconds or so at a time. When I was converting, I'd run from one telephone pole to another on my forefoot, then return to normal heel strike for a minute or two. Gradually, I increased the time to one minute on, one minute off.
It took me three months to get over the new aches and pains, but I was slower. After 6 months, I could run well on forefoot, but not quite as fast. Then, I added a slight push off with my trailing foot. I immediately could run 5 sec faster for 400m, but I couldn't hold the push off. After another three months...now nine months in... I was faster on forefoot than my old heel strike.
This was 15 years ago. I think with the newer low drop shoes and adding the barefoot strides, I could have cut this transition time in half today.