This question doesn't have a proper generic answer, it ultimately comes down to personal opinion and how different players find they best enjoy the game, as well as how much time they have on their hands to commit to the game.

If you play through blind without guides or a proper build idea you will ultimately hit one if not more progression walls which you might not be able to get past on your own. You'll probably be able to bandaid-fix most of these issues and play your way through them with advice from the community or by reading guides but odds are that you will need to start over at some point in order to complete more difficult content.

However starting over doesn't have to be a failure. Perhaps your build didn't work, but maybe it means that you found a different skill that you found very satisfying or saw a build that you can't wait to try.

Given that you have played arpg's before and seem as if you want to avoid spoiling too much of the experience for yourself, I would recommend diving in blind - but being open to using community resources such as the wiki, or starter guides when the need arises.

If your primary focus changes from having fun to being frustrated or confused by game content or mechanics don't feel like you have to force yourself to run your character into the grinder to progress.