It is the seventh day of the seventh month so the first bulls will have been run this morning in Pamplona. I've been to the festival a couple of times myslef. I think that first time was in 1983 with Sean and Chris.
It is important to realise that you can't outrun a bull. This means that unless you start very close to the bullrung, the beasts are going to come charging past or over you at some stage. The real trouble can come if a bull ever turns and charges the people that it has already passed rather than continuing on to the ring.
You can be assured howevever that you are allowed to carry a rolled up newspaper to protect yourself in extremis.
It really is a unique experience. Bizarely it is most thrilling the first couple of times that you do it when you haven't got the slightest idea what is going on and you half expect a bull to rush out of any doorway.