To close things off, here are some additional tips regarding the Ascension Trials.
Balbala, the Traitor
When fighting Balbala, she will occasionally disappear. The room will slowly fill with Poison Gas until you find her by walking around. When you find her, she will proceed to slam the ground around her, so be prepared to Dodge Roll away.
Xyclucian, the Chimera
When fighting Xyclucian, it will jump onto a stone pillar. Attack the stone pillar to break it. Xyclucian will fall down stunned, giving you a window of time to deal damage uninterrupted.
Trial of the Sekhemas
Trial of the Sekhemas is all about not getting hit. You have an Honour resource that goes down when you get hit, and losing all your Honour will result in a failed run.
Starting from Difficulty 2, (Area Level 45+) the Honour you lose ramps up drastically. To mitigate this, use Relics that have "Honour Resistance." This will greatly reduce the Honour damage you take from hits, letting you complete a run more easily.
Monsters in the Trial of the Sekhemas will drop Relics.
Trial of Chaos
The Trial of Chaos is generally difficult to complete for most characters. Don't underestimate the map hazards as they can quickly stack up and become very dangerous.
Unfortunately, some runs will present you with bad effects/debuffs that you just can't power through. With enough tries, you may get lucky some runs and pick tribulations that don't affect your build too much.
Overleveling
For many players, it's advised to overlevel before tackling the Trials. While you can start the first Trial of the Sekhemas early in Act 2, waiting until the end of Act 2 to level up more and get stronger can make the run much easier.
The same concept can be applied to Act 3 when you first gain access to the Trial of Chaos.
Similarly, you can tackle the third difficult of Sekhema (Area Level 65+) much later, even as far as level 75 or so.
This decision is ultimately up to you. As you play through the Endgame System, you'll find plenty of Djinn Baryas and Inscribed Ultimatums, so don't be too worried about failing.
Character Planning
Many players coming from PoE 1 expected the Ascension Trials to be easy. For many players, these Ascension points (outside of the first 4), are quite difficult to obtain.
When planning your character, don't expect to get your Ascension Points easily. If your character needs all 8 points to be strong, it will only make getting there more difficult.