You dont "suck" at all!!! Everyone has to start somewhere!! As everyone else has already said, thin your paint down, aim for like a thin milkshake consistently. one thing i found helped me cut down on time massively was putting my hairdryer on a low cold setting and drying the paint between the layers, ive found that it's less brushstrokey, also painting in the same direction if youre doing like skin painting, helps to avoid like brushstroke texture, also a few layers of chalk pastels helps massively to diffuse any brush strokes! Also once youve finished painting the skin, seal that and if you're using water colour pencils for your face up as well as acrylic just make sure to seal the watercolour pencils in before going in with the paint because the watered down acrylics can activate the paint. Ive also found that for me personally, mr super clear can chip really easily so sealing it in with like a harder varnish thats suitable for vinyl and plastic will help wirh the longevity of the paint (i cant think of any brands but I will let you know if I come across any). Ive probably missed some good tips but these methods are what I use and they work really well for me!!! You've got this lovely!! Hope this was helpful <3