If you're sure that you have no modules installed, and your theme isn't a tragedy of some sort. Then the upgrade is possible to be done easily within a few days.
However, a junior developer would apparently take a bit longer.
Along with hiring a group of senior developers, you should try contact some shopping cart migration experts to migrate data from your old store to your new store. Free demo are available, so don't be reluctant to give it a try.
You must take professional help.
If you face any trouble during the new Extender setup process, consider having technical assistance. And we have expert technicians who can resolve all your extender issues in an instant. Simply chat with our experts.https://newextendersetup.co/
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