Nervous? Not at all! I'm incredibly excited, and can't wait for August to get here. I took a year off after getting my B.S., and worked at Office Max full time while I took the PCAT, applied, interviewed, etc. Trust me, a year of working 40 hours a week in retail hell (Office Max is the pinnacle of retail ineptitude) was more than enough to make me excited, not scared, of pharmacy school. Yes, the course work will be very tough, but I took some very difficult upper level chem/bio courses for my degree at Michigan: so I have the scientific background, and the study habits, to be ready for the coursework.
Of course, the biggest change will be financial changes. Instead of working 40 hours a week, I'll be working maybe 2 nights, and hoping student loans and grants will cover the rest of my external expenses. My parents are putting their home up for sale in the spring, so if they sell, I move out. Luckily, I have their help if I room with other people, and have that avenue.
What I'm most looking forward to is this spring/summer. You should too, so make plans to travel and get your head clear as you prepare for school. I have lots of plans; a trip "up north" for a week at my buddy's cottage (upper Michigan is called "up north"), a 4 day golf outing "up north," a trip to Boston to see my Tigers play the Red Sox at Fenway park during a weekend. I might even fly out to Denver to visit my sister and her boyfriend.
So relax. Enjoy yourself this summer. Remember that you've reached the pinnacle of educational achievement; acceptance to a Doctoral program. Don't be afraid to tell people, when they ask, that your in the "Doctor of Pharmacy" program at "XXX University. Its not a matter of gloating, its a matter of the fact that you deserve some recognition for your efforts and accomplishments. Most people don't know the educational background behind pharmacy.
Anyways, I'm rambling as usual. Hope this helps! Good luck!