Great job and I can tell you it can become very addictive.
I've been modding Seikos (and other watches) for several years but the huge number of companies now selling great aftermarket parts for Seiko mods make for an amazing choice of parts.
You definitely need a magnifying glass (Loupe) its absolutely essential, you can not do without one.
For the seconds hands there are some techniques to making this easier, I used to cut a very thin piece of masking tape and stick it to the back of the seconds hands, this makes positioning it very easy. I use a hand fitting press (I see you have one in the picture) and I find these have much more accuracy and control, however many modders seem to like the individual hand fitting tools and I started using these when I first started, but these can slip when installing the seconds hand if its very tight, so a lot of care is needed. I would also suggest using a dial protector when fitting or removing hands.
Hands can also be easily scratched when fitting so it can be beneficial to put a small piece of clear plastic over the center of the hand when installing to help prevent the hand fitting tool leaving any marks.
Above all enjoy the process
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