The national strength and conditional association (NSCA) CSCS credential is highly viewed in the sport industry. The American Council on Exercise has a sport conditioning CEC bundle as well.
As a specialty that works with a given population such as athletes just taking CEC’s is plenty unless your entering into the sport industry. Additionally with in the sport conditioning area you have to have a specialization into a given sport such as baseball to understand the mechanical principles involved.
Of course you can. The important factor here is to be certain you understand the mechanics, purpose, and “feel” of these drills. Best thing is to spend a month or so training yourself with them and documenting your own progress. If you are comfortable and confident with them, I say start implementing them a little at a time.