Start by asking friends and family for referrals if they’ve had a particularly good experience with a mover for their international move. Do your own research, too: check if the mover offers an international move, what its reputation is like, and if they are licensed and insured to move cross-border.
Finally, speak to their team before you schedule the move; that will tell you how responsive they are, and if you are comfortable entrusting your move to them.