The way autism may present varies drastically from person to person. As ASD is a spectrum, it varies in severity and how it will affect a person. There are varying levels of support a learner with autism will require. Merely being understanding and supportive will be enough for a lot of people with ASD, but not all. 

Using visual aid (images and illustrations) and keeping instructions clear, but concise, will help with processing and retaining information/focus.