Noob smoob boob... Really hate the 'noob' terminology. We were all the freak there, and as quickly as the industry moves we'll be there again won't we?
I use ASIII, that's what I use. I'll tell folks that, is it a recommendation? Not really, I just use it. It's quality and does the job. Just like others do.
Hard to clean? Shorting your CPU? No experience here with either, haven't shorted any bridges at least.
I compare the HSF / paste / CPU mounting process to a surgical procedure. Alcohol and Q-tips (cotton swabs) for cleaning, if it's sticky stuff try WD-40 then alcohol. But the actual application always was a pain... until I came across the surgical finger glove! Long story short... got these from a vet as we had to apply a topical to the cat's ear blah blah....... a surgical glove, but just for your finger. Very sterile, very cool. Place the prescribed daub of paste on the core and dab the glob of goo lightly spreading it onto the core. If too much put on another finger glove and repeat as the paste sticks to the glove thus removing a bit blah blah blah. Neat tidy and clean.
If your application does get a bit sloppy, gently clean excess off the chip and bridges area with alcohol and Q-tips... foam swabs work well too without the lint that may occur with cotton so take your pick. Just be clean about it eh?
As far as lapping, well it's good thing to have flat. But flat is only relative to the surface that it's mating with now isn't it? The 'flatness' of the core is affected by the level of the socket and the PCB it's mounted on so variations do exist. Mounting method, clip or bolt-on, can really hose it all up. Bolt on is my preference as you can mate the HSF to the core vertically with four corners pressure to provide the 'seal' as such. Clips mount poorly, I use them, as long as they use all six lugs. But they still wiggle around don't they? Bolt on wins.
And it's late now and I have a house to paint tomorrow! So enough rambling but will check back later.