Required to read Guides?

[Reinhardt_Azureheim]

No you don't need to read guides.

It is expected for endgame content like extreme trials and savage raids, but there are also parties for blind progress. Nothing you have to worry about now.

A half decent healer can pick you up and keep the party alive for a moment when you die as a tank. In harder content there is a second tank who can take over the boss when you die. There is room for mistakes.

Pretty much this. I recommend blind practice to improve your general perception of the game and mainly guides when you absolutely dont understand how something works, especially while levelling and learning before high difficulty content.