Hi there!
Yes manually data import can be a time-consuming and challenging process, that is annoying. So, as an alternative to it, you may take a look at data2crm service, as it offers a direct HubSpot CRM data import in a fully automated way.
So, in this case, CRM migration becomes more simple and easy to perform the process. In case you have some questions, regarding products migration, please mail me directly.
Thanks, hope it will help