How does shorting XRP on Binance work?

I could do with some advice before I do this, just so I get it straight in my head first, then I can look at the risk.

Say I am in $3000 at $0.45 and my account only has XRP (6700), nothing else.

Current XRP price is $0.31

How do I short XRP from here, how does this actually work?

Step 1 - Borrow 6700 XRP to sell at $0.37

Should I sell all my XRP (actual + borrowed) 13400 tokens or just the borrowed tokens? End goal is to make up loss, so end up with $3k USDT.

Step 2 - Buy XRP at $0.27

Amount depends on answer to how much I sell at $0.37

Any help would be greatly appreciated, or any calculators where I can plugin in my existing position, borrowed tokens and sell and buy price points, so I can work out the correct $sell & $buy points to regain my $1000 loss.

I know this will be straight forward once I get my head around it, but I would rather ask than make a rookie mistake.

Yes, you would need to sell off your current holdings to open a short position, otherwise your gain from a drop would be negative due to the fees, assuming no leverage.

If you aren't using leverage it's easy to calculate how much XRP needs to move for you to recoup your loss.

Once you sell your XRP holdings, calculate by what % your balance needs to increase for you to be back at $3000. That's how much XRP would have to drop if you were to open a short position.

I'm not saying what you want to do is a good idea, just helping you understand it.