incubation gets easier the more you do it. Even though i love to hatch eggs after a while it becomes a chore. Remembering to turn eggs every 8 hours can become a pain. As far a those $9.00 wal-mart thermometers they aint worth a plug nickel. the last two i got were off by as much as 4 degrees and in a incubator 4 degrees can mean the difference between hatching and rotten eggs. I would trust the mercury therm. as far as liner if i remember i put down the soft spongy shelf liner, it is soft and has holes to let hot moist air through the wire but i also just let them hatch on the wire too so you can do either.