I also had to 'train' DH.
We had endless rows over him making a sandwich and leaving the point, sharp knife handle hanging over the edge of the worktop. Hot drinks, power tools, leaving the iron plugged in whilst the DCs were running around near the board with him elsewhere......
I threatened to leave him, I threatened that if a child was hurt I would never forgive him and that I would be clear to friends and family what his attitude had been. Looking back I should have paid nursery for more childcare so that I did n't have to rely on him. Saving my sanity would have been worth it, eventually the stress caused a hospital stay with a suspected brain tumour. And he did n't cope with that well.
It got easier as the DCs have got older, I changed things round so that medicines, cleaning stuff is all grouped together up high, kitchen knives are limited to the basic so he can't just reach for another one. DIY stuff when I find it is thrown in another high up basket when I find it in the house.
I now get to relax my responsibility head whilst the children are at school and I've trained them to think for themselves and consider their own health and safety.
Find a nursery or a trustworthy friend, get a regular three hour break per week, use the time to have a run, a cup of tea in peace and a little cry if you need one. You need this in order to be a good parent.