You can manually enter pretty much anything you want into any of the accounts. When I write checks, for example, I enter them manually. When I later download the information for my checking account from the bank, Quicken automatically reconciles which of those sent checks have been cashed. That assumes that your description of the individual payment matches the banks description closely enough. Sometimes, they don't quite match and you end up having to delete your manually-entered record.

I had contractors from Best Buy install it because since I've retired, I've become rather lazy about doing chores like that. However, they installed it in a manner of minutes using the trim kit that had been from our previous Whirlpool microwave oven. I am unfamiliar with the "Whirlpool Gold Convection Microwave" in specific but suspect the trim kits might be similar.

You can certainly try baking cookies or anything else. However, given the design of the oven where all the heat is coming in from a vent on the left side rather than evenly distributed above and/or below as in a conventional oven, I suspect that you might find cookies on the left side of the sheet might be rather more well done than those on the right side.

There's a little icon with 3 horizontal stripes (which I've heard called the "hamburger" icon) to the left of the painted controls. Press that and an expanded backlit menu comes up. Using this, you can set the cooking time, press a menu option, then select the cooking power level (from 10% to 90% with the default being 100%) and then press the Start icon. You also have to use this "hamburger" icon to bring up the menu options to use the oven in convection oven mode instead of the default microwave oven mode (the two modes are separate and can't be used at the same time).