Just picked up a PC Jr, are there any gotchas I need to know about

I recently picked up a PC Jr and I'm curious if there is any tales of wisdom people know that they can impart since I know nothing about these specific computers. Things like not using the OG power brick with a C64 unless it's been rebuilt, that type wisdom. I haven't popped it open yet but I was told it worked a few years ago when it was last turned on.

I heard also a jr-IDE is what I need to aim for to be able to boot and load software without having original floppies.

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EDIT: Thanks for the info all, it turned right on and booted up to Kings Quest which was conveniently already located in the disk drive. It looks and sounds great!