To be honest, (sentence)

Use this phrase when you're not really sure that you should share an opinion, but you share it anyway:

To be honest, I don't really agree with the direction the company is going in these days.

You can also include words like "completely" and "perfectly":

To be completely honest... I think that he's a creep and he's just using her for her money.

You can also put "to be honest" at the end of a sentence:

I've never really liked action movies, to be perfectly honest.

(something) is a long shot

A "long shot" is something that has a very low chance of succeeding.

A: About the keynote speaker – do you think that we could get the governor to do it?

B: Hmm. Well, it's a long shot, but it's worth a try.

To remember "a long shot", imagine someone who's trying to shoot an arrow at a target. The shooter is very far away from the target, so it's unlikely that the arrow will hit it.