I will fix any issue in opencart or wordpress
Yes, I need your login details, If the problem is related to the setting then I need only admin login, if problem is related to code, then i may need for FTP login or if problem is related to database then I may get need for cpanel login.
Yes you can directly order if you think issue is small. But if you think there is a complicated issue then the best practice is to contact before the order.
The Best Practice is always, to explain the issues one by one. It will be better to explain point wise, so that i will be easy also for me to understand the issue.