If this is your first my friend I sympathize. Many/most of us that have had big block 440 BBodies know your pain well. I recently sold the X after 48 years - can you imagine how many starters I changed in all that time? I don’t even know if they had minis back in the day - no matter I/we all learned to switch the full size originals in no time at all. It took practice and was a learning process under a shady tree.
You unbolt the drivers side header so you can move it around, then unbolt your left side motor mount, lift the motor a bit to usher in the new or junk yard starter - yeah maybe you had to give the header a couple of wallops but alls fair in love and war. Wala it’s done! I’m not saying it wasn’t a pain the first few times but it soon became a rote process. Done in no time at all. Now days with the minis it‘s even easier. I’m not saying you have loads of room to work with but you do have more but the process is largely the same. Heat shields, wraps etc should help the unit last longer (some controversy on that). My last unit was a Pro-master. Expensive but theoretically better able to withstand the heat soak. Does it - I don’t know but the friend I sold the X to is still running it and things are fine.
Practice makes perfect - or close to it. Our BBodies have a personality all their own - next time will be a breeze.