SAP 6.0 to NAV 2017. Tips please

We have two companies merging one of which has SAP. We want to move that company over to our NAV 2017 system. And I'm looking for tips on how to approach this. Both companies are quite small (10 users each).

Company 1: SAP 6.0 EHP6 (7.31)
Company 2: NAV 2017

My questions:
1. Are there any handy documents or tools available?

2. Is it 'just' a matter of hiring a SAP specialist and a NAV specialist and put them together?

3. What preparation homework can the SAP company do to prepare for the data move?

Thanks in advance for any suggestions!