Transfering Sibelius 4 projects to Dorico 2

Any tips for this? Just export MIDI from Sibelius and import?

Thanks

Export MusicXML and import. You’ll need the free Dolet plugin for Sibelius, here: https://www.musicxml.com/dolet-plugin/
If at all possible, get your Sibelius files into Sibelius 5.1 or later, before using the Dolet 6 plugin - it’ll give you a better result than the Dolet 1 plugin.