[gentoo-user] uefi gpt grub2

Over the last few days I have tried to set up using uefi gpt and grub2. After many hours of frustration I have gone back to grub legacy and mbr.

I followed the Gentoo wiki  and Arch wiki and several other sources of which I failed miserably. Is this technology fairly unreliable? I booted from a uefi enabled usb stick but still fell over. Is this ready for mainstream or 
 still alpha like?

Also does ufibootmgr change motherboard firmware? Somehow this feels 
wrong if the case.

John D Maunder