Hum about leveling, crafting and killing mobs will be enough. I think that tagging another combat skill will be a loss of points, because even if you will be better at the first beginning, you will regret it since you are at level 6-7. Tag Repair instead of Science, it's always usefull, and more if you play alone. You will be able to have more than 200 in Big Guns, 120 and more in Repair 150 in Outdoor, and 100 in Science, at level 21, don't forget it. Try to build your character anticipating what he will do in-game.