Taking possession question

[Gene Walker]

I received a tax certificate from the state of Alabama on a 4 acre parcel. I have already accessed the property in my name at the Jefferson county courthouse. There is no structure on the property but there is someone with a travel camper and there are 3 horses on part of the fenced in property. How should I approach the person on the property? Can I go ahead and take possession by putting up No trespassing signs and marking the property boundaries with stakes and orange flagging?