[quote=@Antarctic Termite]
Q1: When rolling against ourselves, how do we determine the dice pool we're rolling against?
[/quote]

You use whatever relevant skills you have for it and if you don't have one, then its a base d6. If you are trying to climb a wall and have Climbing 3, then you'd roll d6 for both your roll and the counter roll. If you are trying to eat a squig for the first time and don't have an "Eat Squig" ability, then it would be d6 just like your Do Anything skill. Again, I'd prefer if people try not to stretch what each broad ability can do too much, otherwise it limits the humor of being proficient in really random skills.

[quote=@Antarctic Termite]
Q2: Do we get starting XP?
[/quote]

Nerp :c
You only get XP from failed rolls. You can use it to level up skills but not pass a skill check. To level up a skill, you need at least that level amount of XP. If you are trying to go for Reckless Driving 4, you need at least 4 XP to do so.

[quote=@Antarctic Termite]
Q3: When we level up a skill and take a similar one, say, from 1-Pyromaniac to 2-Molotov cocktail connoisseur,  do we keep the original skill or has it been replaced?
[/quote]

You'd keep the original skill but you use the newer one. Basically in the CS it would go like:

[list][*]Pyromaniac 1, Firebomb Fanatic 2, etc
[*]Kicking 1, Punting 2, etc
[*]etc...[/list]