Need help changing clutch cylinder...

[foob]

This is the first time working on a car, so I'm really new at this.

I'm trying to replace my master clutch cylinder...

I disconnected the clutch line from the hood, and crawling in front of my seat, I removed the clevis clip, but can't remove the clevis pin because there's a "light retractor control" box blocking it from coming out.

Anybody have the same problem before?

Also I can't find the mounting nut.

Should I remove the whole dash? Does it help?

Thanks.

It's a 86 corolla GTS HB.

Foo