Also, if you are using any kind of retinoid/retin-A you MUST use a sunscreen every day.
There is also a teething period with retinoids/retin-A, they tend to make your skin worse before it becomes amazing. When I started I got a purge phase (mild thankfully) with a smattering of spots, and some dry and flaky skin around my nose.
I was very, very careful to build up use slowly. I started using retin-A twice per week, then built up to three times, and now I use it every other day. My skin wouldn't tolerate ever day.
I cleanse my face, apply a very thin layer of moisturiser then wait for it I dry completely. Then I apply the retin-A, wait for an hour, and then apply my facial oil and more moisturiser.
Retin-A is more of a long term benefits thing, if you grit your teeth throughgd teething problems it will make you skin unbelievingly flawless (and its castle lessened my wrinkles) but it takes time to start seeing a difference. Three to six months into regular use is when it starts becoming v. noticeable 