OK you can try the light bulb method, I have never done it but many have reported success with this method however what if the bulb burns out unbeknownst to you?!
What I'd do:
remove whatever you need to remove (could be rear seats, bulkheads etc) to get at:
large front hose from the front water pump to thermostat housing, disconnect it at the pump
2 drain plugs on the engine, one on each side low down just above the oil pan, remove these plugs and poke the holes with a thin screwdriver or coat hanger wire to make sure they drain
1 drain plug on each exhaust manifold same as above
disconnect the raw water intake hose that goes from the transom mount to the impeller housing (you have an engine mounted impeller like a Volvo correct?) hold it down to drain, and let the impeller housing drain.
Now you can rest easy the engine is protected. I put a bit of gasket sealer on each drain plug and re-install them, that prevents rust from forming over the winter.
while there are other things to do during winterization, this is the ONE thing you MUST do to prevent freeze damage and losing the engine. And once you do it, NOW, you know how to do it. NO need to pay that much when all you are doing is, changing the motor oil, fogging the engine, drain it, and change the oil in the outdrive. This is really simple stuff, the problem with many I/O boats is the access is bad, it can be a pain, but it has to get done.
My brother has a 2020 Chapparal with the new Merc 4.5 V6, he ran out of time to winterize this year but I just showed him how to use the Merc easy drain system, and it is fine, we will fill it up with antifreeze and change motor oil and drive oil in the spring.
So that's my advice, once you get the seats etc out of the way, it should take about 1-2 hrs, you will feel a bit stiff after crawling around in the bilge but no worries with all the water out.
I modified mine to make it easier to get the seats out of the way, one year pulling out that huge bench seat was just too much so I got rid of it & repalced it with 2 36" long bench seats for a pontoon boat, they are just a press fit between the gunnels, and the wood behind them, I cut in half and put hinges on them to make it open like a door.
Here's a schematic of what I did, back in I think 2007 or so, made it much easier. Seats go in front of the wood bulkheads...
during winterizing it back in 2007, wide open access:
https://www.dropbox.com/s/9pz3pzuz8kuvm ... s.jpg?dl=0with the seats in place:
https://www.dropbox.com/s/ao7q5x2adv5z0 ... p.JPG?dl=0Mine's already winterized we get temps in the 20s starting in November so I ususally do it the first week in Nov. In addition to draining it I also fill the engine and manifolds with no tox antifreeze, not the cheap -50 or -60 stuff (that gets hard below 10*F) but I use either -100 West Marine AF, or I mix up my own from Sierra no tox AF (freeze protection down to about -30*F).
been doing this myself, about 20 years.