Item ID Conflicts are harder to work with, as few mods pay attention to their own stuff and assume forge will pay attention for things for them it seems. This is a big issue as itemID conflicts tend to not crash anything right away, and thus when you go to do something, you may end up with a face full of cylinders full of antimatter, 1 gram per item, for example, while mining something that doesn't drop as a block.
Then there are potion ID conflicts, which I haven't seen in ages IIRC, but more recently I have seen EnchantmentID Conflicts which, unlike potion effect IDs, crash the game proper when a conflict exists. Thing is, you are told that there IS a conflict, and it names a mod in the log if you look close enough that isn't getting the ID it wants, but you still have to fix things yourself.
Thankfully, all of these things can be obtained from the NEI ID Dumps you mentioned in your guide. Whether or not the items are pre-shifted or not is beyond me, though. I try to avoid mods that have lots of small items with thousands of keystokes I have to subject my hands to simply to change an item ID conflict. Mods like Custom NPCs with their starting ranges on IDs do my hands and wrists a massive favor by doing that.
Then there are potion ID conflicts, which I haven't seen in ages IIRC, but more recently I have seen EnchantmentID Conflicts which, unlike potion effect IDs, crash the game proper when a conflict exists. Thing is, you are told that there IS a conflict, and it names a mod in the log if you look close enough that isn't getting the ID it wants, but you still have to fix things yourself.
Thankfully, all of these things can be obtained from the NEI ID Dumps you mentioned in your guide. Whether or not the items are pre-shifted or not is beyond me, though. I try to avoid mods that have lots of small items with thousands of keystokes I have to subject my hands to simply to change an item ID conflict. Mods like Custom NPCs with their starting ranges on IDs do my hands and wrists a massive favor by doing that.