The LP, like most others is rather simple. Lift blocks on top of the struts and sub frame spacers. Lots of other companies are out there as well. I am partial to Anderson Design and Fabrication, but largely they all do the same thing. ADF does offer larger kits FWIW. An alignment will be needed after installing the lift. You shouldn't need anything more than some jack stands, a good height jack, and hand tools.
I think for tires I have seen people run a 235/65/17, but asking on FB may yield you better results. Groups like "Mountain Roo Brotherhood" are invaluable for "Subie Newbies" getting into the realm of Subaru Off roading and overlanding.
-Jason Osborne