Nothing to it, especially if you're going to get a j-mold liner (preferred).
On an overlap, you might need a couple of extra hands, but kids will do since there's 0 skill required.
I did my 30 foot j mold liner with a total of 3 adults and I helped my neighbour change his overlap liner on a 24 foot pool, between the two of us and a 6 and 10 year old we had it installed in no time.