Hard to pronounce

The words I can't pronounce well are "insist" and "expect".

I seem to be bad at "S" pronunciation. In "insist", there are two consecutive "S" with a vowel between them. It's very difficult for me.

I don't know why I can't say "expect" well. Actually it's quite new word for me. I learned the appropriate way to use it around the last autumn, and I knew it was very useful, more like essential word.

"I expected it to be -----."
It's almost impossible for me to say it.

I expect myself to be good at those pronunciations.
Is it a strange sentence?