Getting it done from a gun is wayyyyyyyy less painful. U can also get an infection if not done properly from a needle. Needle has to be sanitized properly. U can go almost anywhere for nose piercing for e.g jewelery store, beauty salons. Just make sure the person performing the piercing has a license or a certificate. Ask 'em how long have they been doing this. The longer the experience the better it is. U wanna make sure they peirce it at the right spot. Not too low or high. Also get solid gold stud if u can. Even 10 k is fine & wouldn't cost much. That way there is ismply no chance of infection.
Once done. Clean it at least 3 times a day with alcohol for at least 2 weeks. Make sure u also rotate the stud so no flesh grows around it. Complete healing usually takes anywhere between 6-8 weeks.
Best of luck.