Is it easy to change a headlight lens?

One of my headlight lens is looking yellow. I want to just buy a lens n replace it but is it difficult to do? Or is it better to replace the whole assembly? I rather save money just with the lens.

I DON’T KNOW WHAT TYPE OF VEHICLE YOU ARE REFERRING TO BUT MOST OF THE LATER MODEL AUTO’S DO NOT SELL JUST THE LENS.
I WOULD TRY TO GOOGLE YOUR MAKE YEAR & MODEL FOR A LENS MAYBE YOU WILL FIND SOME ONE WHO SELL THEM BUT I DOUGH IT.

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