It took me years to figure out how to play slide at a giggable level because I couldn't find any resources that I found really helpful, so I made the video I would have wanted to see six years ago. It takes the "years of figuring it out" and condenses it into 3 minutes so you can get started practicing the techniques instead of guessing at the techniques.
A a side note (because I've been asked this before), the reason I tuck the pick with my pointer finger is fairly thought-out. When you hybrid pick you're using pick-middle-ring to get around. When you tuck the pick with your index finger you end up using thumb-middle-ring and the muscle memory transfers almost seamlessly. Plus, when the pick is in your index finger it takes no time, thought, or effort to get it back in playing position if you want to do regular strumming for a chorus, then kick into slide for the solo. And without it in your teeth you can sing lead or harmony.
Thanks!