Marie Spaulding takes you very carefully through the felting process she uses so that you can see and understand completely. Jan sent these links to us because she knows we like to learn new things or improve our skills. These videos and the LivingFelt channel provide very comprehensive help with regard to felting.
The bamboo,wooden mats can be a bit hard to come by these days. In our area there is a shop called Ishka which sells them. The plastic, non slip matting can be found in the cheap shops and you can buy it by the roll and cut it to size. One of the Instagram felters uses plastic with a wider mesh so the gaps are about 1cm. She too, makes little felted bowls and pots.
Part 1 of the video is at the top and part 2 is at the bottom of the post.
You can also find some written instructions for resist wet felting on FiberArtsy.