You're wondering ... GUI tools?

Can You Recommend a GUI Tool for Managing My PF Rule Set?

Yes, GUI tools do exist, e.g. pfSense (FreeBSD based), PfPro (OpenBSD based and supposed to be portable, but by now stale - last update 2005)

No, this tutorial is taken in without them

Learn to understand pf.conf first, then make informed decision

Keep your pf.conf readable, already!

($EDITOR + pf.conf is faster anyway)