Ways of learning Yiddish:
1. Eezy shmeezy yiddish book by Moshe Sherizen. Good basic words
2. “Back 2 Basics” sichos of the Lubavitcher Rebbe, which have a linear English translation into English. Most of these predate the 1979 “atzmiyus” sicha, so should be fine even for shtark misnagdim for learning Yiddish
3. Zundel Berman seforim stores sell tehillim and chumashim with a modern Yiddish translation.
4. There is an old Yiddish primer called Der Yiddisher Lehrer.
5. There are a few good “Workmen’s circle” (secular Bundist) Yiddish primers, by Lilly Kahn and Sheva Zucker. Good Yiddish, but disturbing phrases like “Oyf shabbes geyt min tzum kretchma” (On Shabbos we go to the pub).
6. Heinteger American Yiddish gets diluted with English words and changes spellings of some words. You can get free easy Yiddish examples from Chinuch.org
7. You can listen to the Daf Yomi shiurim of Rav Avrohom Karp on Kol Avrohom or the Yiddish mussar shmuzzin of Rav Avigdor Miller on Kol Halashon. As you listen, your mind will get more and more used to it. The first time you listen, you may barely get anything, even after hours of Yiddish study. A few weeks later, you are getting much more.