Yes, I hear what you are saying.
You could either get lost or lose all confidence, that is for sure. By all means examine the differing teachings handed down to us.
If the teacher is reputable and the methodology sound, then there should be some discernable difference to the lives of those who are earnestly practicing under that teacher.
Lastly - you will need to take the plunge yourself. Try out a particular teacher's meditation practice and evaluate it yourself. If after, say one year of practice, it doesn't suit you - try something else.
There's no conflict with particular methodologies having internal consistency yet differ from other competing methodologies.
In some places, Ledi Sayadaw referred to Vipassana Meditation as "insight exercises", I have vague recollections that he also referred to samadhi/jhana as "concentration exercises" - they are just skilful means to develop particular mind states. So, imho, it doesn't really matter if Ajahn Brahm's method for attaining jhana appears different to my own teacher's instructions - so long as the applied method gets you to develop particular rarified mind states - that is the important thing.
“No lists of things to be done. The day providential to itself. The hour. There is no later. This is later. All things of grace and beauty such that one holds them to one's heart have a common provenance in pain. Their birth in grief and ashes.”
- Cormac McCarthy, The Road
Learn this from the waters:
in mountain clefts and chasms,
loud gush the streamlets,
but great rivers flow silently.
- Sutta Nipata 3.725
(Buddhist aid in Myanmar) • •
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