Good lighting and magnifier and it's easy. Just take your time, I can tell you how bad desoldering sucks....
I'm curious to see how this is going to work. I'm having troubles picturing the chute cannon, cannons?? Not exactly sure about it but I like it.
Temperature-controlled iron would be nice, but not absolutely necessary. Use the biggest tip you can get away with without causing solder blobs.
Aim for nice concave fillets, so not too much solder. If it looks blobby you are probably using too much. I quick google of "surface mount solder joints" should show you what you are looking for. If it is acceptable, don't try to fix it! Resist!
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