the two top hoses you can replace in 20 mins...
The one short one a couple of hours. But yes you should be able to replace them yourself....
a little motivation....$1200 dollars at the dealer with the oil separator replacement...I don`t think so....

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1979 320i/6 w/ m20 engine /5 speed
2001 X5 4.4i w/Sports Package
1998 M3 w/HR springs / Bilstein Sport struts
1994 735i Black w/black interior (sold)
1986 528e Black w/ black interior (sold)
1985 325e 4dr (sold)