Steering drag link excessive play:
Probably the nylon bushes in the steering arm. Not too hard to replace them, I had one split in mt Terrano II (basically interchangeable steering system to the D22), from memory a new pair of poly bushes was $25.
In the end I had to replace the whole idler arm assembly as mine was ever so slightly bent from hitting a macropod, but even then the new arm and pivot was only a couple of hundred.
Here is a 'How To' for a Toyota, but the NI$$AN is basically the same. It can be done with basic tools, but getting the connecting link off the end of the arm can be a bit of a pain.
D22's have been around for long enough that getting better than factory bits for 1/2 the factory price is easy. If you did it your self I'd reckon you'd be able to get a pair of tie rod ends, a connecting link and an idler arm assembly for what they want just to do the idler arm.
In this article I will discuss how to rebuild 1986 - 1996 Toyota truck and 4Runner (non Tacoma) idler arms. The plastic internal bushings wear out over time causing alignment problems and looseness in the steering. When used on the street the idler arm is
www.off-road.com
If you have a lift, then the tie rod end angles can put extra stress on the bushes and flog them out, the arm is also a bit exposed and prone to damage, so a brace might also be an idea.
Find many great new & used options and get the best deals for IDLER ARM BRACE FOR NISSAN D21 NAVARA at the best online prices at eBay!
www.ebay.com.au
Or the best option would be just to swap the whole lot out for a new and improved greasable item. 3 bolts and 1 tie rod end and never have to do it again for $250.
https://shop.snakeracing.com.au/navara-d22-heavy-duty-greasable-idler-arm/
Brake bleed: a bottle of fluid and a bleeder, around $30. You'll also need a 8 or 10mm spanner and someone to sit in the drivers seat and push the pedal.
These work well and you can do it yourself ($17).
ToolPRO Brake and Clutch Bleeder One Person
www.supercheapauto.com.au
Radiator coolant bleed and fluid replacement: Not hard, $50 for some concentrate.
Power steering Fluid bleed and replacement: Never done one myself.
Of course, if you find something broken or break it yourself, having a dead car in your drive way is a bit inconvenient. You do pay extra for the mechanic hopefully fixing up his own stuff ups, but often they'll still find some way for you pay for that anyway.
MCM will show you the basics, or just google it, guaranteed someone has done it before.