Some tips I would recommend for first-timers:
1. It's a good idea to use gloves of some sort, probably latex or nitrile. I bet no matter how careful you are, a drop or two will get where you don't want it.
2. I gave up on the tiny drill almost immediately as I could see myself fiddling with it for hours. Plus the plugs that come with the kit are WAY too big to even think about jamming in the tiny hole the drill would make. I ended up using my power drill with a 5/32 (I think) bit. Kept using bigger and bigger until the plug went in but stayed tight. Make sure you don't try to go too fast and push too hard when it gets through you can shove the drill to the bottom and start going all the way through! I also held it upside down while drilling to try to minimize any shavings falling inside. I have no idea if that would happen or if it would cause problems. Don't want to find out.
3. I read that some people taped the bottom where the ink comes out (whatever that's called) as they filled them, or they keep the original orange thing to seal it. I did neither, but found that holding it over the ink bottle caught the drips. As the foam inside soaks up ink, every cartridge dripped a few times. Catching them in the bottle saves a bit.
4. The syringes seem pretty good, easy to use, very sharp! Almost like the kind they use for taking blood. Be very careful! Don't leave them where kids can get to them. But they do have a protective sleeve that snaps over the needle.
5. I put maybe 4ml in the small ones, and 10 in the bigger one (syringes are marked). More experience will show how much they will really hold without overflowing out the hole or just dripping out the bottom.
5. Take your time and make sure all the drips are done before putting them back into the printer. Wipe the outlet dry. Once you do one or two, it's impressive how quick the process is. And once the holes are drilled, I bet it would take maybe one minute each. I wouldn't recommend filling in the printer (assuming there is space) since they drip a little.
6. NOTE: Make sure you twist/press the plugs in all the way or they will catch in the printer. I found out as they made a squeak and actually fell out into the printer. Fortunately it didn't cause any damage as it pushed against them, and I fished them out without any problems.
7. I washed out the syringes to make sure there wouldn't be any dried residue. And I marked them as to which color I used just to make sure there would be no mixing.
8. Reset each one before installing. I got the orange resetter at the same time. Takes about 3 seconds and it seemed to work fine, no issues. Printer immediately recognized them as full, no surprises.
I'm impressed so far! Great product and money saver.
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I haven't done extensive testing, but so far after refilling the blue, yellow and both types of black ink, I cannot tell a difference in the quality between this and the original ink. Will be purchasing this again.