We’ve lifted all flooring in 70s ranch house and the hall was tiled...w industrial strength adhesive .getting it up was a chore and the surface is still a bit rough... cement bits, pock marks in wood sub etc. unsure if i should slowly try to chip away at every raised point, rent some sort of grinding sander to get the surface more level and ready for the vapor/floor install, or even consider cutting it out and replacing the sub floor (about 9’x 14’)... no idea how hard that might be. looking for most economical option.... Also... we are doing nail down install...i have a finish nailer and i wonder if i definitely need to rent a flooring nailer, or if i can use mine.... is that a definitely no no? i used it once before for flooring and seems to have held up fine but it was a very small project (stair landing) and this is 1200 sq ft...the flooring is a thinner variety than some i viewed... builder grade, w ply sub layers. Thanks in advance for any advice!

I have a router table so want to create my own bull nose step. However, there are 2 subfloors. one level with the current riser, then 1/2' osb then 3/4" hardwood. If I create a flat bullnose then I'm going to see the osb as I come up the stairs so I want to create something like this: How can I do that on a router table or is it in 2 stages with glue? I need to create the rounded nose then the step difference of maybe 1/4"