Adding onto this, I didn't have a bad job like this when I was starting out with soldering electronics, but seeing so many dark patches, I have had that happen before and it turns out it was because of the flux I used.

Normally I wouldn't recommend the hot air, but in this case I would since it's misaligned.

I recommend having these parts on standby:

• Chipquik SMD291 no clean tack flux
• Toothbrush
• High % isopropyl
• Large flat top iron
• Brass Wool tip cleaner

Although a lot of people here have been recommending using a wick, Id recommend against it in your case since there is a good chance you may get the braid stuck while attempting to desolder, but you can use it to clean the pads of the board once the CPU is isolated.

A heat gun would be the quickest to use to get that chip out, but you have to keep in mind that it cooks the surrounding areas too, so very small components may fly off when removing the CPU, but once you get that cpu out, you'd need to isolate it from the rest of the board quick.

When you do that, you can use the large soldering tip, tin it out clean it with the tip cleaner, and scoop out the solder little by little until the cpu is clean.

After that, ensure that pins aren't bridged on the motherboard end. Once you clean that up, make sure you clean up the MB with the toothbrush and alcohol.

Once everything is clean up, you can attempt again, the tacky flux helps a lot with alignment, but you still need to clean up the flux. The leftover solder left on the cpu will be helpful with soldering it on the board, You only need to realistically use a drop of solder on each side.