Switching jobs...

The job I'm working now is the first one I've ever had, but I kind of dread going in everyday. There is an opening for a job at a nearby movie theater I think I would like. My questions are: How should I go about this? Do I apply while still working? When would be the appropriate time to quit? How can I quit while keeping a positive relationship with my current boss? Can I use my current boss as a reference? Etc.

I know it's a long block of text, so any help is much appreciated.

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