I used this glue that I also bought at MAC. The makeup artist showed me how to put them on, as well. Don't worry, the glue is not a really strong one- to remove the lashes, you just gently pull them, and they come right off! The lashes did stay on the whole night through dancing, though. Thank goodness lol.
Before applying lashes, you need to do all of your makeup
first. That includes liner, shadow, and mascara. You do not want to have to apply anything once the lashes are on.
To put them on, first I put a little glue on a clean surface. The SA gave me a few disposable masacara wands. I used just a tiny bit of glue and dabbed it onto the end (NOT the brush side) of the wand, just used as an applying tool.
put a very thin line of glue (dries clear) along the bottom of the faux lashes using this tool. Do not put glue on your eyelid.
I waited a few moments for the glue to dry a little bit and become sticky, and then carefully placed it along the outer corner of my lashline, as close to my eyelashes as possible without putting it on my actual eyelashes.
I then used a second mascara wand (still the end side, not the brush) to very gently apply pressure along the faux lashes to push them onto my eyelids to make sure they stuck on. This is not as complicated a process as it sounds! I made sure they appeared straight enough so I didn't have to do it over again. I actually did a good job putting them on my first time! So it is not as hard as it may seem.
Disclaimer: This is only the way I did it that worked for me. I'm not a professional and this is only information I am passing along to demonstrate what I did! Definitely ask a makeup artist the best way to put them on, but this is what mine told me. Good luck!