How to put together cut to length pushrods

I got Comp Cams cut to length pushrods. How do I put the cup end on it? Sure first I need to cut tube to correct length but what then? Do I need to drill the pushrod tube before inserting the cup part? How to insert it, do I just press it? Part number for these pushrods is K8805-16. Pushrod cups are 249-5C5P-1

I have seen comp cams special drill to this job but it expensive and I dont know do I really need it.