You don't have to take the tank off at all. Loosen the bolt under the set and slide it back. The front will lift up. Put a 2x4 under it on top of the frame. There's a small cable that stops you from lifting too high. Easy job when you have the plug tool.
If you only have 8K miles, my advice is to wait til 16K and change them at the same time you do the valve clearance checks, when they are really easy to get to. The OEM plugs will last 16K miles without breaking a sweat.
Thanks. Always good to hear about no surprises. Has 13-14K on it. With riding season here going to check valves next winter (I like winter projects). So plugs will likely be run until 24K if I don't change now.
In my search I also found that most feel the stock wires are perfectly acceptable.
It's time to change. Since the bike is new to you and 12 years old, you may not really know if anyone has looked at or changed them before.
My 2002 bike manual says to change the plugs at 8000 miles. I cleaned mine about then and changed them at ~ 11,000 miles. They needed it and IMO the bike has run better since then. OEM plugs are a favorite and work well.
Changing plugs is not hard but you do need to loosen and move the radiator out of the way. Also moving the coils out of the way helps. Make sure you mark what goes where.
I got my 919 without the stock tool kit. I know a lot of people make fun of them - and I certainly carry other tools when I tour, but most stock tool kits have value to me. And EVERY inline 4 bike I have ever worked on benefited GREATLY from the stock plug wrench. (All kaws and hondas)
After striking out on Ebay most the Fall, went to the local honda shop this winter. I think I paid under $60 brand new OEM tool kit. Added bonus is the rear axle nut wrench. Chain adjust anywhere as needed. So when sport riding, any size wrench needed to reach most side of the road jobs all under one's seat. What's not to love.