1. Don't hack in a populated area (ie. FW/FE in python) unless you know it's clear.
2. Don't greed and do mobs of over 100+, just mob your area (If you're at FE in python, just vac FE only)
3. Don't talk to ANYONE.
4. Zoom/view is your friend so you can always look ahead of where you're going in case there's another player coming. This way you can a) run the other way with your mob and quickly kill it OR b) just run.
5. If you want to play it safe when mobbing, bring the mob outside the map and then kill it (you don't get drops but it reduces chance of people coming while you kill)
6. If you see another hacker, just ignore them and go to another area unless you were already at that area first (mobs get mixed up easily)
7. Whenever you can get into a dungeon to start leveling (ie. nunvice -> crespo -> crevice) do it, it's possibly the safest way to level.
Have fun hacking.