Emissions Factors

I do climate consulting for apparel companies and use the Higg tools for carbon footprinting. I'd like to move into consulting for other sectors -- consumer products, food, etc. -- and am looking for recommendations for sources (free and paid) of emissions factors. Any recommendations would be very welcomed.

Secondly, I am aware of EcoInvent and Sphera/Gabi, but I'd like to know if these can be used to pull emissions factors fairly easily without a deep knowledge of LCA, as I'm not an LCA practitioner. Does anyone have experience with pulling emissions factors from these (or other) databases?