Archival/museum practices on rag papers, sign in pencil.

I know numerous professional photographers who watermark images they post on social media. Why? Because many social media sites strip IPTC metadata and therefore, the only way to identify images as belonging to the photographer is with a watermark. Many stock photography operations also use watermarks. Always include creator and copyright information in the IPTC metadata. Use a watermark if you wish.

ROR - Residual Oil Remover & Q-tips. Moisten Q-tip and go. Small bottle will last forever.

If you do not price your work fairly for your market, you do a disservice to photographers working to earn a living with photography. In order to determine how much you need to charge, go here and calculate your CODB (Cost of Doing Business) - https://nppa.org/calculator. Your fee should be: Your CODB + unique qualities you bring to the job= your fee.

I'm a commercial photographer for advertising & editorial clients, educator and one-time studio owner. I've shot weddings as well. It's hard to turn down work, but the one thing you have as a business owner is the ability to say 'no'. You obviously have read the flags, which say 'walk away'. You need to be able to retain your sanity before, during and after the shoot. If you shoot the wedding, you may do a fine job, but this bride-to-be sounds to be a problem. Even if you do a great job, she may badmouth you in a number of ways which could seriously affect future jobs & earnings. Avoid the aggravation, possible litigation and damage to your reputation. You've seen the flags, say 'no'. One way out is to say, "I just got back to my studio and checked my schedule for the date you requested and that date is booked". You can say 'oops' and be a bit apologetic if need be. Better to eat a bit of crow than suffer the grief that's surely down the road.