I'm always being asked - "How do you spell ......" and I always have to stop and tell the students to look it up or try their best.
Here is my solution!
Have students keep a book of words in their spelling folder. When they need to spell a word they can look it up on their own. If a word is not in their book, they know to look up how to spell the word and they can then add it to their book so that they do not ever have to ask for an adult to spell a word for them!
I have implemented it this year and it has helped with spelling tremendously. Try it out and let me know if you have the same success.