Mobile Phones Sideloading

Hello all

I'm new to sideloading, as I have had a Blackberry Storm previously, and I now have the Blackberry z10 (A Very good phone btw).

I was hoping to get snapchat on the z10 but as of yet there is no offical BB app.

Has anyone successfully sideloaded snapchat? If so what instructions did you follow so I could follow the same.

Is it safe?

Thanks in advanced. Chris