I have one for more than 10 years already, left side of my nose.
I have no trouble with it, didn't hurt and it's not hard to keep the piercing clean. I always bend the pin a bit inwards, i don't want the knob to fly out when i have to sneeze and i certainly don't like a new piercing inside my nose, may i ever bump my nose or get punched in the face.
First week it will be swollen and it'll feel a bit sour.
Within 4 to 6 weeks it'll be healed, also depends on how healthy you live,
if you put more through your nose than just air,
if you cannot stop fidgeting and keep playing with your piercing(s) before the wound is healed.
After it's healed, you may consider wearing something different than the knob you got.
If you have a decent piercer, he will use surgical/ stainless steel for the piercing.
What do you want to wear eventually and which material? Gold, silver, titanium, etc. A hoop, a knob, both?
And may you work with retards, psycho's and/or with machinery, i say: NO HOOPS!
Personally, I like it better on a guy when he has done his nose both sides
or has more than one piercing on the same side.
And besides, do you really care about what will be said about which side you have pierced your nose?
If you choose left, there's a story to tell about right and vice versa.
So, whatever side you choose, make it your own choice
and let the remarks pass the other side of your nose.
Enjoy.