I used 4 years of college classes with essay requirements, 3 years of pharmacy experience and a lifetime of customer service to draw upon. On top of that, I used those real life experiences I've taken from getting out there and doing. I used my colleagues and my instructors, I've done my best to remember the little lessons everyone has taught me growing up.
A personal statement is just that. Sure there are guidelines you can use and a checklist to make sure you've covered everything, but the real meat will come from what sets you apart from the herd and what draws readers to want to meet you. I'll give you a recommendation that was given to me and I'm sure has been listed many times...
Check yourself into a cheap hotel on a highway outside your city limits. Turn every device off that may cause a distraction (tv, radio, cell phone, etc.) and spend your night there thinking back on your life to this point. Think about why you want to pursue a career in pharmacy and why pharmacy deserves a person like you. Take all these notes and write them all down bullet point style. When you check out the next morning, you'll have a whole wealth of information (hopefully) to put into standard format, which is really the easy part of it all.
The point is to deprivate your senses so that all you're left with is you and your mind. This can be done anywhere but this way forces you into a good mindset.