Oil Change and Spark Plugs Question

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Hey everyone, I'm about to reach 105000 miles and I figured along with an oil change I'd also replace the spark plugs. I've viewed a lot of how-to and DIY guides but have two questions.

1) Should I change the spark plugs first or do the oil change? I have an '03 so I don't think I deal with any spark plug tubes but don't know if order matters.

2) It seems that warming up the car will help make the oil less viscous and so it will flow out better but I'm not sure what temperature to get the car to before draining the vehicle. I'm honestly terrified of burning myself so I wanted to get advice on this point about safety or any good techniques.

Thanks!