Lunabrown bearberry isn't going to work like HQ, they are totally different ingredients. I personally don't see a reason to take a break from bearberry. HQ I take a break from but that's only because I live where the sun will beat you if you don't......so rather then fighting it, I stop my HQ mix in the summer and pick it back up once summer is over.
Each ingredient has a "usage rate" meaning how much to use when formulating. Tell me exactly what you want to use I can help you with mixing, amounts, etc. Complicated is what you make it.......if you pick things that are water soluble, they are much easier to work with because most lotions are water based. If you work with things that are oil soluble you just have to find oil based products to use them with which can sometimes get challenging. pH can be a factor but only when using certain ingredients Vit C etc. What you are wanting to use isn't complicated in my opinion.......I have made my share of complicated things so I would be honest if I thought it wasn't anything you wanted to take on.