Convert Author website from Joomla to wp.com

Ten years ago, I received help to design a website about my father. It’s currently on Joomla PHP 5.6.40. The website is in dire needs for an upgrade and, having lost contact with my former helper, I’m looking for assistance to convert the website to wp.com. The end goal is to have a great-looking site that I’ll be able to manage on my own. I’m worried about various aspects of this process: - I'd like the website address to remain unchanged. - I'd like the Joomla website to be up and running until the new [login to view URL] site is ready to launch. Joomla content should only be copied onto [login to view URL] until the project is complete. The website reflects years and years of work, and I don’t want to risk losing any content through this process. - I’d like to maintain the logic of the original site, and have a very similar format in wp.com. I’ll need some help to identify best possible formatting fits, before I make the decision about look. - Once all content is copied and converted, I expect a period of trouble-shooting to ensure that the new site and links work as intended. I will have to be satisfied with the look and operation of the site before launch. I’m looking for somebody who is very familiar with conversions from Joomla to [login to view URL], is detail-oriented, and works well with non-tech clients like myself. Please provide references. This is not an urgent project but can be done over the course of several weeks.