Demand Planner / Inventory Forecaster

I own a barefoot shoe brand called Birchbury.com, we've been in business for 6 years now.

As the company grows, I'm looking to hire a demand planner / inventory forecaster.

We order a new container every 1 - 2 months so I need someone part-time to help us forecast what will need to be ordered.

Please let me know your experience as a demand planner or inventory forecaster.

our lead time is 5 months.