I'm having someone else print an exhibition for me. He suggested he do a custom paper profile up for the paper I want to use. Then he would send it over and I would correct my image files to the custom icc. After I like what I'm getting, either softproof(probably not) or just proofing off my 2200, I would then convert the image files to his custom icc, resize and sharpen and then send them over to him.
My question is though, would I not just "assign" the profile as opposed to converting it?
Is there less of a chance of a printing mix up on his end if I was to do that?
I think you are perhaps a little confused about how this all works (as I was not too long ago!). If you get a custom profile for the printer/paper that will be used for your job, you cannot proof your photos by printing them on another printer. That's the whole point of these profiles, to represent the color gamut of a particular printer/paper combination. You would load the custom profile on your system and use it to soft-proof your images (your monitor must be calibrated for this to work properly). I recommend having your printer do a test print and making sure it closely matches your screen, then you can be confident of your results.
Also, you do not "convert" images to a printer profile. Images remain in your working space (usually Adobe RGB or ProPhoto) throughout all editing. A working space differs from a profile in that it is not linked to any particular device such as a monitor or printer. When the image is printed, you will have either PhotoShop or the printer driver do the color management, which means taking the device independent colors in your image and converting them to the right combination and amounts of ink to reproduce that color - or, if the color is outside the printer's gamut, to create something close.
Color management is not a simple topic, but it's really worth putting the necessary effort (and expense) into getting right.