Remove nailed in 2x12 (DALEVILLE)

Hi, I have a 2x12 that serves as a step on my deck.
It's 12 foot long.
It's nailed in.
I want to remove it as I'm doing a small mod and having a pad poured and want to miter the corner.
I don't think I can remove it without making it unusable.
Looking for someone to either remove it completely (without destroying it), or clean cutting a section near the corner off where I can then place a new board with the 45.
I don't have the tools for a clean cut, but if you do that might be the way to go.
The pad is being poured tomorrow and I'd like to build the step over the weekend so I'm looking for today 03/07/2024.
I'm offering $75.
if you want to quote the whole new step job, I'll listen but planned to do it myself.
It would be about a 17 foot run across the front.
Feel free to call 540-206-5663 Bill