Well, reading CBR comic files isn't too complicated. You might try popular programs like ComicRack or YACReader. They usually support opening CBR files easily and provide a good reading experience with features like zooming and page navigation.
It's not too complicated. Just make sure your CBR file is compatible and then look for the 'Import' or 'Add' option within Comic Rack. Follow the prompts and it should upload smoothly.
You might also be able to do it through cloud storage services. Upload the CBR files to the cloud and then access them on your iPad using the Comic Zeal app. Just keep in mind that you need a stable internet connection for this.