I have multitextured type 4 hair (4a/4b in my crown, 4b in the middle, 4c on my sides and nape). I got only one set of clip ins. Before you separate your clip ins make sure you wet them and co-wash with a moisturizing conditioner. NEVER try to separate, comb or attempt to detangle curly hair when it's dry.
These are by far the best extensions I've worn, they blend seamlessly texture wise (there is a slight color difference, my hair is black & the extensions are a dark brown color so I'll dye the clip ins).
Have you tried natural textured hair extensions?