Haha, wise man! My own lack of self awareness almost cost my wife her 4s and she would have been furious. I'm no electrical engineer, but I grew up with one in the house and I'm comfortable with assembling and disassembling things if I have proper instructions so I usually take things apart without much forethought.
I found the 4s battery replacement guide on iFixit.com and looked it over. It would be tricky, but appeared doable so I went for it. It was pretty easy until I had to put it together again and I realized that the part I had to reseat was so tiny that I couldn't tell which direction was up. It was clear as a bell in the magnified photo, but in real life it was so small I could barely pick it up with tweezers. It looked like a speck of glitter. I knew cracking open and removing the battery would be challenging. I was ready for that, but not for this. This one seemingly meaningless step took half the time of the battery replacement.
Eventually, I took a guess at which direction to put the piece in. Either it didn't really matter or I guessed right because I'm still married.