That's good that you've got a diesel.
Get to know your boat. I've owned mine for 10 years, repaired or replaced all or part of every system, so I know what's in good shape and trustworthy and what isn't and will require attention in the future. That gives me an appropriate level of confidence and a strong working knowledge of the boat so in an emergency I know what's wrong and how to get at it and fix it.
Just a little back ground on The S/V eastcoastlady . She was on a mooring ball shin deep in rain water. her bimini was blowing in the wind Here is a list of what I have done.
1) pull out the Holli/teak soles replace with fake wood flooring
2) new bilg pump
3) all new halyards
4) All engine filters.
5) drain 17 gals of fuel and replace
6) new Head
7) Pro, cleaned all cusions with new plastic internal covers.
8) rebuild the 3 burner Pressure stove. Works great
9) tune the rigging
10) haul out have cleaned and painted.
11) stuffing box cleaned and repacked
12) New anchor rode and shackles.
13) new Garmin 215 installed.
14 New motor for the pressure water system
15) clean all 4 holding tanks out with bleach and Bacon soda
16) tighten all toe rail bolts to stop the rain water leaks.
Left to do:
1) New Life lines
2) new Autohelm motor if and when I can find one.
3) Speed transducer trouble shoot and repair.
4) Sound proof the Engine locker.
So You are right it helps to get to know your boat for sure.
I got started in December and have spent like 4375 dollars not including the slip fees.
Thanks for the advise Im still learning but having a blast.
have a great week end.