Yes, you have to go through the wheel well to replace that mount. Most people then use a clamp to hold up the plastic wheel well protector. Then, you can put your car up on ramps and use a floor jack with a piece of wood under the oil pan to lift the car..don't lift more than a couple of inches as this puts undue stress on the cv joints and drive shafts. You should be able to replace it in this manner. In regards to the intercooler hose (I assume you're talking about the 90degree one) if it is really soft, you might consider replacing it, but most of our cars get some degree of blow-by oil there and it is fairly common and not something you should be so concerned about. I try to take mine off and clean it out every oil change to be sure.

You really ought to download the 850 service manual that's posted on this forum. Although it's not for your car, there are enough of the same components used it should prove very helpful. Big differences that your car has that you won't have any info in it about is your ECU and other upgraded electricals such as the ETM.

Good luck and welcome to the forum and congrats on your new S70!
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1998 S70 T5 Emarald Green Metallic (125K), 2004 V70 2.5T Ruby Red (45K), Previous Owner of Black '94 850 Turbo Wagon (Sold at 140K and miss her). My cars have been running so well lately they've got me worried.