Vacuum hoses? DIY? help

Hello all, I purchased my first e30 about a year ago she is a 1991 bmw 318is. The car has become an adiction for me and i love it. I am finally to the point of having to do some maintance to the car and am coming to this site for advice. I need to replace all of the vacuum hoses located under the intake manifold, its a rubber hose jungle down there. The car has erratic idle and i have figured out almost every hose down there is cracked.
My question is - Can the hoses be replaced with out having to take the intake off? IS there a DIY anywhere out there? The other question is there an simpler fix that does not require all the OEM hoses? Thanks in advance!
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