To OP,
I was hired off the street this July. My process was as follows:
1. I had two interviews. One with a lower raking HR person, second with the head of HR. I wore a suit and tie to both interviews, I think they appreciated that. Like you I knew some people at my building through some prior commercial driving experience. It always helps.
2. After interviews I had the DOT physical and driving test. These were on the same day, and I passed both.
3. After passing I went to driving school locally in my region. Not intergrad, but a watered down version in my region. Passed driving school (two in my class did not, couldn't get the DOK (depth of knowledge) stuff down, left mid week.
4. Came back to drive two weeks later. In my case I started July 16th 2013, got my 30 days in September 2nd 2013. Have had guys come after me who took a lot longer to get their 30 working days in. You have to get 30 working days in 90 days at my center. No problem for me, but I am assuming this is because it was summer and they needed the vacation coverage.
5. As a note (I'm sure you are well aware), you run the same training route while going for your seniority date. I had to make scratch or better 5 days consecutively (or so I was told). A lot of running and using breaks to sort and line up stops. It gets easier as your knowledge of the area grows, and you get into a routine. As a cover driver now it is hard to get into a routine as you jump routes so much. Some days I don't know what route I am running until 5 minutes before I leave the building, often times to run a route I have seen only once or twice. Lucky old timers like their days off when routes get cut.
I do consider myself lucky to be the one out of seven from the street. UPS is a great company that offers greater pay and benefits then anything else my education and job experience would provide for me. That being said; it is also the hardest job I have ever worked. The mental stress for me personally is almost worse than the physical. I think it will get easier with time as I know more routes, and eventually get my own route.
Hope that helps. Best a luck.
Cheers