May i know how to DIY?
1st, do not have extra laminate flooring.
2rd, if have exist laminate flooring how you take out and place back?
3rd, the chances of the existing flooring might use glue on the lock system while installing so when you take out might affect a few pc than turn up that you need to change even more pcs.
4nd, if you only cut out the spoil part and cut the good laminate lock area to put in, sure high and low and chance of water going in is very very high.
Just to share