Demon's Souls is kicking my ass. Talk me through some solutions.

I've seen things, been places and fought unimaginable foes.

I've been through the tangerine fires of the great Lost Isalith, travelled to the depths of the Tomb of the Giants as well as the otherworldly skies of the deep, green Ash Lake. I do however struggle with the mysteries of the Nexus having faced the boss of 2-1 twice and come up short in both. Armor Spider they call it, but it's probably due to my level 19 soul level not being at just the right level.

I've taken out 1-1 and 1-2 but where do you think I should go from here?