How to Repair Sun Damage on Front Door

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I'm a novice when it comes to home improvement DIY work, and I'm interested in repairing some sun damage I see on my front door. 

On multiple websites (including yours), it's recommended to sand the door down then apply marine varnish.

Can you give me more information on how to "sand and prep the door like usual"?

(1) Do I have to take the door down and off its hinges? I'm petite and I'm hoping I don't have to take the door down. I'm hoping I can just sand and varnish with the door upright.

(2) Can I hand sand the door, or do I need to go out and buy a sander? 

(3) Can I just sand the old varnish off or do I need to sand away the paint on the door too?

(4) I understand it's recommended to put at least two coats of varnish on the door and allow each coat to thoroughly dry before adding the next layer. Can this entire project be completed within a day? If I need to take my front door off the hinges ideally I would like to have it back on when night falls.

Thanks in advance for you help!

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