You don't have to do anything on The Hollows if you don't want to.
Your second contact is the one that tells you to go and talk to some guy there. Once you go and talk to him, he becomes a new contact. After that you can go and continue you second contact's missions (W/o doing any of TH's misions).
Once you reach a good level, go inside and do the missions.
TH is a Hazard Zone, and like with any other Hazard Zone you go either with a good group, or when you're 3 levels higher than the lowers level mob when soloing. I don't remember ever being able to solo Perez Park with any type of char at lvl 7-8. Same with any other Hazard Zone.
Do you want something easier to solo? Stay inside AP or KR.
ps: Just a friendly advice