To complete your comment, Christian. It is simply impossible to become sotāpanna alone. A puthujunas must associate with a person who is at least sotāpanna, to become one. Your suggestion of a master who follows our progress is perfect!
I would agree if I didn’t have access to PureDhamma – but now that I have access to such an extensive explanation, made through the efforts of Mr. Lal – I don’t know if this is still a valid thesis ;)
You still need to “listen” to someone either thru audio or audio-video who understand Dhamma. It works on whole different level then
