Couple of tips for you... (Patreon)
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As I think of things, I'll post for you and tag with 'Tips'
Something I recommend you do all of the time is to always have something under your drawing hand to stop your hand touching the paper you're drawing on.
I use Clairfontaine Glassine Paper - I buy it in packs of 25 sheets which are approx 50x70cm from saa.co.uk If you use the pads of pastelmat, then each sheet has a glassine sheet over it, so you can use that.
You can use a cotton cloth, a piece of tracing paper, a piece of printer paper - anything that will just stop any of the oils in your hand transferring to the paper. Plus the glassine paper helps stop smudging :)
Also, when you're watching the video, you can change the quality by going to the settings cog button, choosing quality and choosing the HD option - this will give you a better viewing experience :)