His neckbeard... blergh. How do I get him to move out and let my darling Lydia move in? Cheers to whoever can help me!

Lydia can move in only if she's your spouse. As for Calder, you could... get rid of him. None of the housecarls are essential if I'm not mistaken.

I should have took him out of the house first before killing him, now he's stuck dead in my house, I had to stuck him up to the chair and roleplay Weekend at Bernies.

I didn't like his ginger muttonchops!

Recruit him as a Blade, marry Lydia

Kill him, marry Lydia

Marry Lydia, have a Devil's Threeway