Definitely use gloves when using bleach or any dark colors!
If you don’t know how to bleach your own hair and have the money, I recommend paying someone to bleach it. if not, or if you need the experience, just do some research and make sure to follow the directions that come with it and don’t leave it in too long.
If you want a pastel look, you can use conditioner to dilute the color (although it doesn’t always work!) And you can leave the conditioner dye in your hair for a day, overnight, or just as long as you want! (To do this you just get a bowl, fill it with however much conditioner you think it’ll take to cover your hair, and add little drops of color and mix until it’s the color you want!)
If you have thick hair, its not a bad idea to get two containers of dye to make sure you get all of your hair!
If you want to mix dyes to get an original or hard to find color, make sure the dyes you mix are the same brand!
One last tip would be to try and find someone to assist you , just to make sure the color looks even and covers all of your hair!
If anyone else has any advice, or any corrections, feel free to chime in!