It sounds more complex than it really is Aarok. Basically to attach a materia you just need a few things and only a handful of guidelines to go by. Creating Materia- After completing the quest to create materia, all you have to do is wear a piece of disposable gear until it has spiritbound itself to you. The time it takes to spiritbond an item varies from piece to piece and level to level, but after the gear is spiritbound, all you have to do is de-equip the gear and select the option to crytalize it into materia. Binding/Melding Materia- When you come across a piece of materia you want to bind to a piece of gear you need to do a few things. First obtain the ability to meld materia by completing a quest, then you will need a piece of gear that's equal too or higher in grade than the materia, make sure the gear has materia slots, and a catalyst that's the same grade as the materia your trying to meld. Select the Bind/Meld option on the piece of gear or materia your trying to put together, select the other components required and wala done. As for what crafter can bind materia for you it depends on what class can repair that piece of gear and what their level is. Multiple Binds/Meld- Same as above you just have to do a quest to multi-bind/meld, and follow the same procedures. The only difference is until you try to meld more materia than the gear has slots for it's 100% success, if you try for more there's a chance of failure and loosing that piece of materia and the catalyst you were trying to use to bind/meld to the gear. That chance of failure increases with each subsequent piece of materia attached as well as other factors such as the grade of materia and how many are already attached.