How the hell do you give your newborn a bath by yourself?

Single mom. And my baby HATES bathtime. He screams. It makes me so anxious. I never know how to hold him while I’m giving him a bath. I feel like I never really get him clean. I have a baby tub that I put in the shower (no bath tub) I make sure the temp is good. I just don’t know how to wash and hold him at the same time.

Please help this dumb mom