Questions about cosplay wig and contact lenses?

For the wig you can simply tie it again. You can even style it to make it look better.
As for the contacts, I recommend that you read a manual or something. I understand your problem, for that was my problem when I first bought contacts. You placed the contacts in the wrong area of your finger. I
used to put in somewhere in this area of the finger:
http://www.solution-lens.com/sites/solution-lens.com/files/handling-contacts.jpg
But then I was told to move it upwards so it's pretty much like this:
http://www.bausch.co.nz/en_US/ecp/resources/image_library/full_img/Contact-Lens-Finger_lg.jpg

As for the right side thing, that actually depends on the contacts. Some don't require you to pick the right. When I got my contacts, I asked that questioned, confused on the lack of the words 'right' and 'left' but then it turns out that any could be used as right or left. It was just that it was >recommended< that once the certain contacts was used for the right eye, it should always be used for the right. However, a little switch is fine when you're confused ,since it can be for both eyes.

No one is aware of what BB appears like. From the outline within the Novel: Another Note, he appears like L. Because he acquired me rattling fooled, while all that point, i proposal Naomi Misora was once truthfully running with L at the same time actually, she was once running with BB, and L was once below the mattress...=A= So i suppose you'll make him as L, however just a little extra evil :D LOL.

Just tie the ponytail on again?

As for the contacts, first read the instructions before putting anything in your eyes. They are dangerous and could cause a fatal eye injury if not used correctly. You need to soak the contacts in solution for at least 24 hours. Put the contact on your fingertip and hold your eyelid open with the other finger and slowly place it on your eyeball. To take them out, use your fingers and slightly pinch the contact. Try watching some youtube videos on how to properly put contacts in and out. Be careful! :)