This is where your consultation comes in, I always ask my clients what they use on their skin when thery come in for a facial or in fact this is always a question on my consultation form as well as, how did they hear of us. It gives you good feedback and not just from the point of finding out about contra indications, but what she expects from their treatment. Ask them if they have any concerns about their skin, they will probably say lines around their eyes, blocked pores, sagging skin, etc, and that's where you take your lead, if you have a product that suits that problem you just tell them about it, ask about their cleansing routine, do they use soap and water, then they will be suited to a wash off cleanser. If they use cleanser and toner, then show them what you have, dont apologise for the price, its a professional product and you are the expert, and are qualified to give them this advice. They may not buy everything you recommend but they may try one or two products, and once you start selling it will give you more confidence. I love selling skincare, I really believe in the products I sell and use them myself and then they comment how good my skin is. Try this, it works and once you do, you wont look back I promise. Hope this helps, if you want any more advice just message me and I'll try to help.