Hey, don't psych yourself out-there's really not that much separating an MG from any other Gundam kit. In all honesty, the first gunpla I ever put together was the MG Lukas' Strike E+IWSP, and that turned out pretty well, so if you've got experience, you're absolutely set.
And besides, keep in mind that most 1/100 No Grades around right now (00 and some SEED) are about the same complexity as early MGs, so again, there really isn't that much of a divide.
MG's are crazy fun, besides. You'll have a blast. That's a SoulBro guarantee
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Did Fats Goodman really die at the end of "Fats' Counterattack?"