Not much of a guide perse, but a tip in relation to the final Nemesis form which can be a bit of a nightmare on this difficulty seeing as if it manages to stunlock you you're pretty much done for.
I recently played through the Z Version on Inferno using the DLC which unlocks all the unlockables including the Infinite Rocket Launcher, Coins and S.T.A.R.S Manual in order to speed through the stack quickly. The latter two can be stacked to improve their effectiveness. You can also unlock these in the Bonus Shop allowing for a stack of 4 Recovery Coins, 4 Defense Coins, and 2 Manuals etc.
Using 4 Recovery Coins, 4 Defense Coins, and 2 Manuals in tandem with the Infinite Rocket Launcher will make you practically invincible, allowing you to tank through the Nemesis' stun lock. I got trapped in the stun lock 4 times and only had to heal twice, but was able to defeat it on my first try.
Using this loadout will make this boss fight far more doable if you're willing to drop few dollars/euros/pounds on the DLC considering it can be a little cheap normally.