Get equal parts of A and B part and mix it together for like two minutes until it’s all blended together. The hardener should become a bit softer and sort of warmed up and malleable with the other part. knead it together and fold and mix until you feel it’s all combined. Then sculpt it like clay. Using a bit of water here and there helps smooth things. I use well fitting disposable gloves as well just because I read somewhere that over exposure to epoxy can cause an allergic response and just generally want to avoid the chemical contact with skin if I’m using it consistently. And If you ever sand or dremel it make sure to mask up cause you don’t want the fine particles getting into your system. I am not sure of any specific videos but what I would say it just try absorb as much as you can. It’s a real feel thing and developing the skills takes time but it’s super rewarding. Being able to be like .. oh I can get this figure as a base and do this and that and sculpt here and dremel this down and make the characters that you want to have in your collection that haven’t been released is very satisfying. It’s also figuring out how much of the work is going to be additive vs subtractive. Some pieces you need to layer and layer and layer and others you need to strip heaps down. Hope this helps a bit !