B and D are my worst two, still struggle a good bit with G, M, N. Less often I get stuck on T, J, P, sometimes F sound (also Ph), occasionally S (beginning to prolong more recently), L and a number of specific words: "Today", "good(bye/night)", "no bother", "Phenergan" (for work, used to be able to say it perfectly), "blood(s)". BUT I can block on any letter at any given time 😂