Hi Janet23406910mdq9,
If you prefer using a mouse, go for it. People work well with or without a mouse. It really is a personal preference.
As far as "having difficulty, even the simplist of tasks," have you thought about getting training? Illustrator really is a complicated application until you learn the ins and outs. Here's a list of Adobe Certified Instructors if you're interested: https://learning.adobe.com/partner-finder.html
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