Something that helped me when i knew i was approaching words i had difficulty with was cutting the word up. Specifically i used to have a hard time with words that have CH in them. so like the word chicken was terrible for me and its a food i love on top of that. I found that if i just left the c out and pronounced it as hicken but said it really fast it was almost unnoticeable. I used this for awhile until i built my confidence up.