Bashful Reaper said:
Invasions are irritating at the best of times, but when you want to be summoned, it's even more annoying. If you can bear to, the best thing to do is kill yourself and don't turn human; then you can be summoned without being able to be invaded.
My friend decided to do a naked, no-levelling run. He got to the Four Kings. I don't think it was lack of armour that killed him. More the lack of being able to do enough damage as a level 4 warrior. Still, getting that far means he's pretty skilled... and a massive show-off.
Keep in mind, I'm not exactly running around naked. Just as a dragon. Because dragons.
The invasions... well, sometimes they're annoying. I don't mind it too much if it's not too often, but I dislike running into people who fight dirty. Like a guy who threw dung pies, or a a guy who glitched through me and backstabbed me while he was standing in front of me a split second ago. That's just annoying.
Usually though, I can handle myself pretty well. Being a dragon has the big advantage that you get a force-like attack that you can spam, and buffs your damage. People get caught out by it so often.
Edit: Oh yeah, I followed the livestream of a guy who played the entire game at level 1, with no ranged or magic, while cursed and wearing the dusk crown ring, and no reasonable armour. He got instakilled by everything. He also went through the dlc for the first time in that playthrough. He completed everything. That was pretty neat.