I can't live without false eyelashes.
The best tips I've learned along the way are
1. To bend them a few times to fit your lashline better before applying the glue. Usually they are too "curved" in shape when you remove them from the package so this helps fitting your eye better. If its too long for your eye size, just trim according to preference.
2. Then also allow the glue to air for 30-45 seconds after application - till it becomes more gummy, you can either blow on them gently or just shake the lash after applying glue.
3. Once you apply the lashes, press on them for about 5 or so seconds to allow it to set.
4. After applying lashes, just coat on some mascara from below and on top so your natural lashes blend in with the falsies.
I only need 5 minutes to get my lashes on these days.

Lashes are also not very expensive, I just get cheap ones asian beauty stores (my favorites are korean brands) and they cost 1-2 bucks a pair or even less. The good quality ones cost 10-15 bucks maximum but they can be reused many many times e.g. 1000 hour eyelashes from eye essentials.
It might sound gross but just make sure you clean it well after use (remove all the glue) and rinse with dettol - the cheap ones last maybe 3 times maximum. There are so many different styles for day or evening looks, once you get used to them its amazing how they can complement your look and make your eyes pop.