Ok first of all, you are going to need second account or friends account with enchanter-character to do this. I couldnt find any similiar threads with search.
I found this method extremely useful while farming Dire Maul for insane-librams, most of the bosses drops 60ish rare items and they are getting disenchanted to Large Brilliant Shards, wich is also needed with the librams.
I have tailoring and jewelcrafting as proffessions.
Start by getting something you want disenchanted to drop from a mob or boss (like UBRS in the picture) and with a friends character sitting in dalaran, you can still use the "Disenchant" option in the rollscreen. This also works for higher level instances and mobs, its just an example.
You might ask whats the exploit here. Well i am disenchanting my blues without being and enchanter, yet still soloing instance.