Please find an optometrist/optician to get good-fitting contact lenses! =)
Basically, what happens is that all contact lenses have different base curves and sizes, and not all of them may fit your eye. Some are more curved, so you may end up with a "bubble" between your eye and the lens, while some are more flat, so you may end up with flared edges of sorts. So basically, an optometrist/optician is the best person to determine which brand/type of contact would be most suitable for your eyes, especially since they can see how the lens sits on your eyes and especially since they have lots of knowledge about different brands of lenses. =)
And as for putting in lenses... The first time I ever did so was at the optometrist, where I spent an hour trying to get on one lens and half an hour getting on the other one... And then an eternity trying to take both of them out and put them back on!! It's not as straightforward as it looks, but once you get the hang of it.... =D