Why should this be a problem? The metric system is used everywhere in the world except the US and few obscure, economically unimportant backwaters. The time to begin most easily is before natural-gas cars are common.
There is nothing sacred about the old customary units. The important thing about a unit-system is, are the units standardized, and do they help with communication. Obviously, the metric system is the best for international communication, and it is the standard worldwide in science.
As far as the difficulty of learning it, anyone who has trouble understanding the metric system might as well give up on education at the start. But just to make things even easier, here is a short tip.
For temperature: don’t go memorizing conversion formulas. Just remember that 0°C is freezing, and 20°C is room temperature. If you wish, you can also add 37°C is normal human body temperature. If you know those three, whenever you hear any weather-temperature in Celsius, simply relate it to those three: 0, 20, 37.
A kilogram is about 2.2 pounds. But it is better to just get a kilogram weight, heft it, and use that as your standard. Nobody sees a kg (or a cu ft) of gas anyway, because it is in a tank or a pipe. The mass of gas (kg) is more important than its volume. You really pay for it by mass, so why state the quantity in cu. ft. (which must be specified at temperature and pressure, which changes the volume of a gas)?
Measuring gas by mass (in kg) would be the way chemists would most often do things.
Easy enough to add 100°C is the boiling point of water. Also a quickie conversion is: 28°C = 82°F.
Go to hell!
Better yet move your sorry ass to Europe!