Preparing guest from ESXi 4.1 for importing to ESXi 6.0

Hello folks! I am going to move several guest virtual machines from one host (ESXi 4.1) to completely different host (ESXi 6.0) via creating the OVF templates and then importing them. A lot of contradictive information regarding to this matter.What should I do (in steps) for preparing the guest VM to move it completely to ESXi 6.0 with different datastore?

What I understood.

1) Delete the guest VM network adapter (or adapters);

2) Delete the guest VM VMware Tools completely.

I am having also a limitation of 256 GB per virtual hard disk of the guest machine. What can I do to delete this limitation on a new (ESXi 6.0) host?

Thanks in advance for any advices!