Use the right analysis order
Build a lien timeline. Determine the normal priority order, then check purchase-money status, recording rules, subordination, modification, or other facts that may alter it. At foreclosure, identify which interests are terminated, which remain, and how proceeds are distributed.
How to practice it
Number the liens in order, then physically mark the lien being foreclosed. Ask what sits above it and below it. That visual method helps determine who must be joined, what survives, and who receives proceeds.