Well, bleaching red hair is extremely difficult, especially if it’s your first time bleaching. Sometimes the bleach won’t make your hair light enough, causing it to turn an orange color. I suggest to get it done professionally. But if that’s not an option, I’d say put the bleach on the desired areas and wrap tin foil on it. Then apply heat (Blow dryer) to the tin foil for ten minutes, then just keep checking your hair to see if it’s at the color you want. Be careful with the bleach, of course. I hope you don’t mind me posting this publicly, so others can get help from it!