I am sure there are some posts here with directions. I may have even posted my experience.
and i did it about 3 years ago.
It was a breeze.
I had to remove the back seat, no big deal, then there is a paint can lid that pops off and exposes the pump. the new pumps and or filters have quick release fittings if I recall. The old ones hose clamps I think.
It was easy and I think I paid about $200 online for the pump and filter.

I feel your pain with the repair bills. You could buy lots of nice things for $5000 in repairs. Like Buy an 8 year old Accord that needs nothing but oil and tires and brake pads.

I'm thinking used GM next. Honda's dont depreciate enough and I dont want to spend $30,000.

__________________
Steve Danville
what i did myself.
CPS
rear shocks
MAS x 3.
SparkPlugs (twice)
Fuel pump & Filter
Window switch
replaced both failed horns with Honda horns.
Cleaned ERG Tube
Oil changes
Oil consumption Fix
Brake Pads
A/C Recharge
Anti-Freeze change X 2.
Front Shocks. Monroe. $90
Mercedes Warrenty Work:
Harmonic balancer,power steering clamp. Cat converters.Drive Shaft Bearing.s
Replaced Outer Lower Tie Rods and front lower ball joints at 156,000 miles