Perhaps it can also ease down things by stating that most battlemechs are made with a general purpose and construction cost for mass production in mind that is why they are what they are but elite mechwarriors (like you!) will often need a more customized ride to bring out your full potential.
As for the process I'll just list it down in simple bullets:
- Have selection of base stock mechs from the selection of existing Champion mechs.
- Set one champion mech to be the step-by-step guide (one time, repeateable if needed) where the player is taught how to use the mechlab features by turning a stock into a champion.
- The 'challenges' are to complete configuring the other stocks into champions. It's simple but the repetition should be enough to get them used to it.
- Perhaps allow players to test the mech before and after to see how the changes matter (players can see differences in engine sizes, heat dissipation etc)
You can give extra tips like the player should note if they end up needing more ammo for their weapons, more heatsinks, or if they find themselves not getting much use out of a weapon most of the time and they would be better off replacing it with something else.