It’s a rather Western notion — stemming no doubt from our socially-conditioned and totally-unexamined hyper-individuation — that we can guide ourselves DIY on the spiritual path.
The reality is, that without a teacher, we will always approach the spiritual path through the same ego mechanisms that already imprison us — and dig ourselves in deeper.
Someone who would never dream of climbing untutored into a small aircraft and expect to survive their first flight will nevertheless pick a technique from a book and practice it.
Life can be your teacher if you have an awakened human teacher to reflect life to you in an awakened way.
So we need a living guide who has been the route ahead of us to provide direction that is not just the more-of-the-same, and to mentor us in the techniques & practices which, done *properly*, will catalyzed the necessary openings into new inner territory.