How to replace sub-frame Bushing front side on a 1999 Chevy Lumina 6v 3.1L Base.

What is your question?

The car is creating a creaking metal sound which is the sub-frame mount is completely rotted away and there are no specific video of explanation for the Chevy Lumina. The front is what needs to be replaced and I'm not sure how many bushing mounts I should buy. I've done a bit of research so I understand the basics but every car is different. Any tips or something specific I need to know?

What makes this problem better or worse?

Sub-frame Bushings

How long has your 1999 Chevrolet Lumina had this problem?

Been quiet a while, some few number of years.