There are different ways, check out different options below:
1. Contact your bank 3-4 weeks before your trip to let them know that you will be abroad.
2. Look for a currency exchange service, near you.
3. Exchange money while on your trip
4. Use bank ATMs to retrieve money while abroad
Liz-Desir Travel Group might recommend you money exchange locations and Bank ATMs abroad, also highly recommends that you take out a reasonable amount for any personal expenses that only accept cash.