so lets say im working on running the blender, should i tie him up to me and run it so he doesn't hide while i act like nothings happening?
I'm not a big believer in acting as though nothing is happening. His reaction is happening, and it isn't a reaction that you want. So you work with his reaction to the blender and not the blender itself.
Find out where his threshold his. Does he react the moment you pull the blender out? Does he react when you turn the blender on?
Take your time, do not rush him. Don't expect immediate results. Give him a chance to find his comfort level.
Take the blender out and set it on the counter. Talk to your dog, sing to your dog keep it light and fun. Give him treats, play with a squeaker toy. Find out what makes your dog happy. Just do it for a few minutes and then put the blender away. No biggie.
If he reacts to the blender just being out - say really reacts and runs out of the room and hides, take the blender and set in in the middle of your family room. Leave it. Ignore it. Walk around it. Clean around it. Play around it. Let him investigate it on his own. Sing his praises when ever you can. Treat him when he passes it. (Carry treats on you 24/7 so you can catch the action.)
You're building confidence, not punishing his reaction.
If it's just the sound of the blender (at this point, he'll learn the blender makes the sound and might be afraid of the blender as well) then play and sing and make him happy, then flip the blender on still singing and getting him excited and treating then flip it off quickly, treating and playing and being silly. Increase the amount of time the dog is around the blender.
You're building confidence.
Remember, he doesn't have to stay right on top of the blender (or what ever he is reacting to) he just has to not react. If you turn the blender on in the kitchen and he calmly walks into the living room, that's ok.
When you have company over, keep him on a leash. Praise, treat, play while the company is there. Don't allow him to run off (his reaction) but don't force him to greet the people. Teach him to kennel to give him a chance to feel safe.