Not sure if this is a confession or not but 12 months ago, after loads of building up my confidence and asking probably 1000 questions on here, I tackled the headgasket on my tractor.
After spending upwards of 6 hrs in the freezing cold I started her up (she started on the button) and let her heat up. Feeling rather pleased with myself I took her for a drive, got back, gave her one final checkover and, balls, noticed water seepage from the front of the head where the gasket meets the block.
After trying a few fixes to no avail and putting off the inevitable thought of having to do it all again, I did it all again
Once off the problem was pretty clear, other than the usual model sticker on the HG packaging, the only other piece of paper in the packet was one that showed a picture of the gasket with very clear instructions on exactly where you need to put some instant gasket
of course I had 'overlooked' this piece of paper.
On the plus side, I had the head off, on and running in under 3 hours on the next try and its still running perfectly to this day
Wayne