It is a lot of heel.. I started running right on my toes, now I just land toe first and then let the heel take some or most of the strain depending on how tired I am.
Changing my gait has had a lot of effects yes – namely at least a 15% speed increase and about a million percent comfort and enjoyment increase. Running used to be sheer tortuous pathetic shuffling, now it's quite fun and I actually want to do it.
I managed to make it home last night minimising the pain by keeping my left leg very relaxed, sort of plonking it down instead of using the muscles, which minimised the pain.
And if by DIY you mean I am not being coached, then yes 🙂