Here is a litmus test that indicates whether you can begin to trust a non-Sedevacantist priest’s doctrinal orthodoxy. Ask the priest if he thinks Vatican II is salvageable. If he says “no” without qualifications, then you can proceed further with him. If he says “yes”, then run in the other direction!
Here is a holy priest you can trust. Listen to this extract of his November 24, 2013 sermon given in Veneta, Oregon. This YouTube video is programmed to start and finish at the relevant portion which is from 24:20 to 27.20.