How to start an analogy

mojtaba vahdati"It's like to throw yourself in the mouth of a lion!"

This is ungrammatical.

mojtaba vahdati"It's like throwing yourself into the mouth of a lion!"

This is grammatical but not very natural.

So how do you say it?

mojtaba vahdati So how do you say it?

You're trying to come up with an idiom that doesn't exist in English. What exactly is it that you're trying to say/express?

I'm not looking for any kind of idioms teechr. In fact, I'm emphasizing on the usage of the first part of my sentences above. It's like .... .
Let's completely drop the lion's issue. How do you say "doing something is like doing something else" in English in the case that you would like to start with a subject pronoun like "it" or "this" and so on?
Is it proper to start with

I'm still not fully clear as to the type of sentence you're looking for.

mojtaba vahdatiIs it proper to start with "It's like"?

It can be. It depends on the specific context.
e.g.
Scuba diving is amazing. It's like being in another world.

mojtaba vahdatiDon't sign that contract because it's like having yourself to ask for a