Go for 3 serious heavy sets after a decent warmingup. If you feel confident do 4.
I you press for example 100 kg(%) for 6 reps;
take your time doing a couple of decent warmingups, but don't waste your energy with endless reps or endless moderate sets. Do them light and go for 3 sets.
after that do 80, 90 and 100 kg(%) and try as many reps as you can.
The same for incline, one set to get comfortable with the excersise, and you don't even need a additional weight, the barbell is just fine, after that three sets.
Again, if you feel comfortable, add only one set and make sure the load is high enough.