DIY vs. Shop Jobs

Wrench where you can, outsource the rest

Do It Yourself	Leaving to a Mechanic
Clean drivetrain & lube chain	Truing wheels
Check bolt torque	Hydraulic brake bleed
Maintain tyre pressure	Complete gear indexing on electronic drivetrains
Tighten headset	Tubeless setup on non-TL rims
Wash frame & inspect for cracks	Press-fit bottom-bracket swaps

Takeaway

Master the basics to save cash; call the experts when a mistake could trash expensive parts.