Hello All, I'm searching for any advice, knowledge, tricks or tips with regards to replacing both upper and lower heater hoses in my 1995 850 "urbo" I recently sprung a leak and have ordered and received the new hoses from IPD. Along with them I also received a new heater hose juction kit containing new O-rings and plastic retaining clips/connectors to make the connection to the Fire Wall coupler.

While one end of each hose is a simple hose clamp and no trouble before I drain the system and get started I want to ask for advice.
1) Is there anything special I should look out for or damage I might cause?
2) Tool or process to disconect the existing hoses at the coupler?
3) Advice or instruction to make the new connection?
And finally,
4) Is there a way to refill the system, pressurize and check for leaks with the car not running, prior to reassembling everything that I removed to expose the heater hoses? (buried)