I'd like to make my own face and hand creams. I believe you can buy the oils and butters online and it's relatively easy. However I'd like some first-hand advices as to what to mix as I don't want to end up with something too oily, or to crumbly. I'd also like to add essential oils but not sure whether you can add those if you are going to apply the final product to your face. Any input? Thanks.