purchased animated icons, need to edit

What Bob said,

There is no shortcut past learning how to use After Effects.  Seeking only what you "need" to know to achieve your vision is a sure path

to failure because you do not know even enough to know what you need to know.   Even the seemingly simple task of asking a question here on the forums, as well as understanding the answers, require a base level of knowledge about After Effects.  You MUST spend some time learning the software. You MUST first do the projects that tutorials tell you to do because the tutorials are taught by instructors who know what you need to know better than you do.

Example:  When you go to class for math do you walk in and tell the teacher that you want to learn how to solve a specific algebraic equation?  No,  the teacher teaches a linear curriculum, teaching you what you need to know, starting with basic additiion & subtraction, fractions, multiplication and division, etc, etc...SO, that when it comes time you will be able to understand algebra.

BTW, Depending on what kind of files your "icons" are,  you might even first need to learn the basics of Illustrator as well.

Feeling discouraged? Challenged? Overwhelmed?  Maybe you should should just hire someone who has already taken the time to learn how to use these softwares to do it for you.  You see learning the software takes time and work, which is why people who succeed in learning it are able to make money applying their knowledge

Start here:

Classroom: After Effects video tutorial series for beginners | Creative Cloud blog by Adobe

and here:

Adobe After Effects Learn & Support