Where does the Bible say we can read the Bible for ourselves and choose our own doctrines or faith based on private judgement?
eph 4:5 one Lord, one faith, one baptism!
divine revelation has to be taught by Christ thru His apostles! Matt 28:19
It doesn't say we can judge for ourselves, but nether am I willing to place complete trust in fallable man. Case and point, this site has many Christians from many denominations with differing doctrines.
There is a witness to the Truth in the Holy Spirit. If the Holy Spirit is in us, and we listen to his prompting, I am certain we at a minimum will be taught what we really need from him in a timely manner. Then eventually he will teach us all truth as promised.
And as we exercise patience, we can put into practice what we know, first is loving one-another.
I do not think private judgement exists in a spiritual sense. What we call bias is always present. It taints our every interpretation of scripture. There is a bias that is good and correct, and it is that Christ died on the cross for our sins. Then he rose again on the third day.