I did a tutorial on Scenes recently:
The OT manual is, shall we say, a fine example of engineer-written documentation i.e. unintelligible to a lot of people. This is a much more complex machine that the A4, and the manual is necessarily thicker. It was my first Elektron box and I struggled to understand the manual. There are still things about the OT I’ve never mastered, and not for want of reading the relevant chapter over and over!
But… don’t let me put you off buying one! You won’t regret it, and as you say the folks here are mucho helpful. If you already understand Elektron sequencers, that’s a great start.