Diy ..
If you take something appart you take pictures as you go .. you lay the parts out in order on a bench or the floor so that you can see the order they came off and so refit .
hence an oil cooler is not hard .. its just laying out the parts so you know what goes where when you refit them .
Pictures young man .. hell even i do this at times .
Ok suspension can be down to what tools you have .. if parts seize and trust me they do its a bit more complicated to get things appart .. failing that its replaceing them .
Top mounts can seize .. if you cant seperate it then you will need a new shock or a garage that can seperate them.
Pasm then you need to make sure the shock doesnt spin when removing the top mount .. you have to lock the collar either in a vice or the special holding tool .
Collar is the disc with x2 cut outs in it.
I think if only as a learning experience then have a go .. make sure you can afford the parts if it all goes wrong though .. by wrong i mean its seized and they aint ever coming appart .
If it all goes pear shaped .. you take the shock / hub to a local garage and get them to work on it .. but you wont know untill you try .. and the satisfaction of being able to do it yourself far out weights the cost saved .
Garages spend thousands of pounds training their guys .. you learn yourself and that an accomplishment .
Why do you think i come here
Answers like this and encouragement !