Current Magento poduction version is Magento-22.214.171.124 and we have a free domain that I can use to setup and test / staging version Magento-2.2.3.
I'm confused to the best method to migrate version Magento-1.9 production store to Magento-2.2.3.
Do I need to duplicate my production store to the free domain, or do I install Magento-2.2.3 on the free domain and use the data migration tool?
Reading through "Creating a Migration Plan" (https://devdocs.magento.com/guides/v2.2/migration/migration-plan.html), "Step 3: Dry run", really confusing and hard to follow for none server people, throw away lines, "Copy your Magento 1 store to a staging server" and "Fully migrate the replicated Magento 1 store to Magento 2", how, a link on how to do this would be great as I only use FileZilla for updates to Magento etc.
Really need an idiots guide, step by step, to migration, anybody help?
Also, the production Theme isn't supported for use with Magento2, will this cause issues?