The more planning and preparation involved, the more smoothly the international move will go.
Before choosing an international moving company, do everything possible to minimize the amount of items you will move. Now is a good time to declutter and maybe have a garage sale. It might be cheaper to sell or store many of your items and buy replacements in your new country, rather than pay to have them shipped there. Ask the name of the trade organization that they belong to & the amount of time they have been in business in both the country of origin & the country that you are moving to.