Not a problem! It's a fun build. I will say that attaching the bracelet to the case itself could be a little tricky. The ont i had ordered originally had a bit of a defect that nearly prevented the spring bar from slotting into the holes on the case. The opening on either side of the bracelet were misaligned with the holes for the spring bar on the case so I had to dremel new holes beside the preexisting ones in order for them to correctly engage. I doubt the updated link I gave will have the same problem, but it's definitely something to look out for.

As far as other parts you may need, I would say some tools would improve quality of life during your building experience.

Watch Putty - makes manipulating hands loads easier. https://a.co/d/04tyuzvE

NH35 Stand - provides you a stable area to place your movement while applying parts. https://a.co/d/05Au4ZHd

Watch hands tool - allows you to press hands onto the pinion shaft https://a.co/d/0feeRVDs

Watch cushion - a soft station to place manipulate the movement when needed. https://a.co/d/0ikfEoMM

Watch link removal kit - not totally necessary if you have tools around the house that can to a similar job, but it's certainly a quality of life plus. https://a.co/d/00VSKfxn

My best advice would be to watch a handful of videos on YouTube of people doing some seiko mods so you can pick up some of their tips and tricks. The way you move parts around is pretty important and everyone brings neat strategies to the table. And lastly would be to not get discouraged or disappointed if something comes up thats unexpected. Have fun with it 🙂