Shaking real bad front end when I brake I can't even go to the mountains

Caliper hanging up? Not braking evenly? Do a visual check on rotor to see if you see anything odd about the brake surface inner and outer. Had this on a maxima recently rear driver. Brake surface was weird also. I told owner it needed a new caliper months ago but they elected to put new pads and rotor on and I wasted their money 4 months later replacing pads and rotor again along with caliper. He said pedal feels better also. Also check to see if any bolts are missing on bracket or caliper. Had this before also.

How about checking for a bad wheel bearing or ball joints. These will cause shaking.

I hate to admit this but, the first time I put new pads on a car I used a screw driver to shove back the calipers this made them uneven when braking which did make it wobble, also normally it is the rotor needs to be resurfaced.

In all the brake jobs, I have never used a device to back off pads before taking caliper off. The correct way to do it is to break bleeder screw loose and relieve pressure that way and this also gets rid of the worst brake fluid in your system. Down by the wheels is the heated and spent brake fluid in your system. Never push old fluid up through your master cylinder. Purge it out the caliper and add new up top. Fill master before doing this as to not introduce air into your system.

Oh yes you are quite right, I had to find out the hard way, done a lot of brakes since then pretty much as you said, didn't have the internet then heck I even will ask for directions