I would recommend that you remove the hair algae by hand as much as possible (scrape, pull, ect.). There is a neat little video on Extreme Aquatics showing a hair removal and tank cleanup on high speed. If nothing else it will likely make you feel like your task is more doable. Scrapers are good but you can also find the plastic scrapers used to clean kitchen stoneware dishes (works great for me and doesn't scratch).
The nem can poison a tank but if you got it out quick you are likely good. It is likely that by the time you posted this if you didn't have a tank die off you were quick enough. If you just don't want to risk it a bag of carbon is like $15.00 and drop it in a chamber to help.
As stated in earlier post light reduction and possibly nutrient reduction will help with algae growth.
I am sure that there are better bits of advice than what I have to offer, best of luck! Don't give up! Just think of how much more you will appreciate the tank once it is looking great again!