Replacing sd card slot orginal 3ds xl

Ok so i started to replace the sd card slot on an original 3ds xl but i have a very cheap soldering iron and it does not by any means have a fine tip on it. Anyway i ended up burning some of the solderpads off where the pins solder to the MB and in turn i think i slightly burnt the MB as well but i ended up scraping some of the burnt crap off so im wondering if i would be able to drop a bit of solder where the pins go on the MB and then proceed to solder the new sd slot in? I of course will be investing in a new soldering iron with a fine tip of course before i do but im just wondering if it would work or if its a lost cause and i should buy a used working MB?