Welcome Saskia
I agree that some of the lessons on SBL are a bit complex and intimidating, however there are many which are easy to jump into and that you'll benefit from. You just need to pick those which will stretch your abilities and knowledge and move you to the next stage. Use SBL as the great resource it is, take what you need, leave that which you don't.
I disagree with those who criticise Scott for the way he presents his YT videos, he explains why he presents them in the way he does in one of his videos. For somebody who's giving players the chance to expand their abilities and technique, many for FREE, I think he gets a lot of undeserved stick.
Playing with other musicians will always help you to use the stuff you've learnt and will bring on your confidence - which is no bad thing.
Perseverance is the key...