Ok, so, I have an HP Envy 15 1050NR with the following specs:

Intel Core i7 720QM
CPU Arch : 1 CPU - 4 Cores - 8 Threads
CPU PSN : Intel Core i7 CPU Q 720 @ 1.60GHz
CPU EXT : MMX, SSE (1, 2, 3, 3S, 4.1, 4.2), EM64T, VT-x
CPUID : 6.E.5 / Extended : 6.1E
CPU Cache : L1 : 4 x 32 / 4 x 32 KB - L2 : 4 x 256 KB
CPU Cache : L3 : 6144 KB
Core : Clarksfield (45 nm) / Stepping : B1
Freq : 931.09 MHz (133.01 * 7)
MB Brand : Quanta
MB Model : 7009
NB : Intel DMI Host Bridge rev 11
SB : Intel PM55 rev 05
GPU Type : ATI Mobility Radeon HD 4830 Series
DirectX Version : 11.0
RAM : 6144 MB DDR3 Dual Channel
RAM Speed : 665.1 MHz (2:10) @ 9-9-9-24

There seem to be some very old threads on the subject (one here and one on Insanely Mac) and I'm wondering if there have been any new methods that ease the process for this particular laptop.

HP tells me the Envy 15 supports UEFI or has it enabled (not clear what they meant); a friend of mine said he's heard that it boots BIOS first, then UEFI. Does this ease the way any? Is there any chance I could install from a vanilla OS X DVD? The best I can find on the subject is this guide but I have concerns over the RAM (I have 6 gigs in the laptop and I'm not sure how to remove just one of the three sticks) and the fact that my DVD drive is external attached by USB (no internal on this beast).

Can anyone help, even it's just to point at the necessary other forum/wiki posts?