I've only flown into Mexico once, to Ensenada, and that was VFR. Admittedly, I was not well prepared ( prior to joining CST) and was unable to contact anyone after crossing the border until within the 25 miles of Ensenada. The tower was very gracious about that. In April, I'm planning a flight from KLHM to MMML with a stop to refuel and clear, then to MMLT to fuel again then on to MMSL for 10 days. Would you all recommend IFR to MMML then VFR after or IFR the entire route. I'm flying a Vans RV-9A if that helps.
Thanks,
David

"Once you have tasted flight you will forever walk the earth with your eyes turned skywards, for there you have been and there you will long to return" - Leonardo DaVinci