Yes. Pins 0,1 are for hardware serial. Never use software serial on those pins. I believe any other pins can be used for software serial on a Uno
If you disconnected Bluetooth before uploading, that's fine and normal. That is not the issue anyway, it's the anything. If you are communicating via hardware serial via Bluetooth, you can't use the serial monitor - you can just look.
You had better learn, and there is nothing to stop you doing it. If you insist on disobeying the manufacturer's clear instruction, you will eventually deserve all the grief you get. You may also find you are exceeding Arduino's specification, and the same applies.