My sister got married (in Srinagar) during her intern year - she was very busy, so she left most of the planning for the wedding itself to my parents and our relatives in Kashmir. She did pick out her own wedding outfits and jewelry - you have quite a bit of free time during your 4th year of med school, so she was able to squeeze in a 2 week trip to Pakistan to meet with designers and get fitted several months beforehand. As for the wedding itself, she ended up flying in a few days before the festivities began. She also hired a wedding planner to coordinate the reception here in the US, which took a lot of stress off of her.
I’m also getting married during residency - since my wedding is closer to home, things are a lot less complicated. I still hired a wedding coordinator to do the ground work for me; from my sister’s experience I learned that a good wedding planner is totally worth it.
I wouldn’t worry too much…many people have been in your position before and pulled off very nice weddings. Your schedule will certainly be hectic and you’ll definitely need help from professionals/family/friends. However, just remember its not totally unmanageable, and you will likely be able to find time to personally plan out the aspects of your wedding that are most important to you.