AGREED MAGENTO 2
Hey!
I'd be more than happy to take care of all of the tasks highlighted, I currently manage a VERY large site that has multiple prices based on customer groups - along with differing payment methods, shipping methods, registration + registration activation, the list goes on...
More than anything, I wouldn't take on a job I wasn't 100% comfortable with completing, feel free to drop me a message if you would like to give me a chance, I can show you previous examples if you wish
Regards,
Reece