I sell if I'm in profit and there's nothing wrong selling earlier if you're in +%.
And I hold if the coin that I've bought is still bleeding. Yes, there's nothing wrong to sell and hold until you see there's profit. That's the basic strategy that I do if the coin I hold and I believe is still bleeding and I'm in the lose, no problem of holding it.
I only lose if I sell with loss.
This make little sense to me. What matters is what you believe in the future for the project. If you are on plus or minus doesn't really matter.
I would rather say trend is your friend, unfortunately in both ways. Cut bad coins that are going down and find better projects with a bright future. Don't be afraid to cut losses.