I found this to be a really good sidemount resource:
Online video training courses for Scuba Divers
www.sidemounting.com
thank you both of you i know both source. I am on the way to put my hand on a hollis katana 2 for a great price. And also a first and second stage like the one i have already. I will bring my current reg and the one i will purchase at my LDS for minor adjustments to make it SM.
This being said i feel comfortable to start my sidemount journey without and instructor for now. Back in the days i dove couple of time double while i was living in mexico i had the chance to experiment this, long hose, short hose, a drill etc...
My current setup while i am solo diving is a back mount 80 or 119 sometimes, and a sling a 30 CF on my left for redundancy.
If i go baby step i don't things i will face major issue going in by self in SM hence i am over 60 solo dive so far out of 200 ish with a buddy.
This will be exclusively shore dive with a easy access, average depth while entering is 33 feet.
I read numerous article and watch plenty of video about SM diving including the two you submit. Unless someone tell me otherwise i will give it a shot by my self. Open mind to any comments.
Do i consider taking an instructor? Off course. Will it be a steeper learning curve ? Most likely.