It's smart to anchor the base of the trunk to the opposite side it was bent toward. It's not necessary but prevents it lurching through the substrate as it fights against the training and prevents potential root damage. When i used cloth pots i just stapled it to the other side, then pulled the wire/string thhough to create some minimal tension to balance it out.
it's referred to as low stress. You may see the progression of added fingers to leaves stall or reverse due to some mild stress, but it'll manage. i.e. maybe 5-finger is follwed by anode of 3 or 5 instead of advancing to 7 etc...
Try to make it close to a 90-degree bend. start by bending in 2-3 spots close together. keep bending each spot to create a bend with minimal damage. Get that trunk horizontal because it's going to try to lurch back upward for the rest of its life, lol. Expect some angle to result and that's okay.. just secure it well early to minimize it.
Anything below the bend is going to be worthless, even if you manage to keep it as tall as the rest of the canopy. prune it off. Anything facing down faces a similar but less difficult path as far as apical dominance's impact. prune that off too. Retain as many leaves as possible at all times. removing a branch doesn't mean you have to take off the leaves, but if facing down probably need to remove those leaves too.
Training with autos isn't too important. the size will be small that just forcing things to grow outward a bit is enough to space it out and maximize surface area for light absorption. Talking about a 50-100g plant more times than not unless you do some awkward things to delay flowering.
I see poor watering habits. Don't partially water. you should be fully saturating the media, wait for some minimal dryback and repeat. Also, if that is pure coco, you really should have 33% perlite or so in there. Despite what gets repeated ad nauseum, coco is not ideal drainage and aeration by itself. better than a heavy soil but still less than optimal root zone properties. -- 50% of volume perlite for a heavy soil. "Perlite" has several alternatives. Also, if it is 'soilless' grow you need 10% runoff, religiously and fertigate every single irrigation.