Looking for a bit of advice - wanting to restore our floorboards in one room. They are tounge and groove but in some places they just have a gap...I presume where they have been lifted at some point? If I'm going to attempt sanding down myself what do I do about these bits? ( attached a pic!) I wouldn't fill in the gaps with rest of floor as I like the look with the tounge and groove but worried the random bits will make it drafty and let lots of creepy crawlies in! I was planning on using osmo but was told that's not great for floorboards? Finally, am I better off getting someone to do it for me? My budgets limited!