replacing 510 with 625

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just purchased a new dish 625 reciever off ebay(155.oo with shipping)it came with a dp plus seperator with the one input and the sat 1&sat 2 in.my question is do all i have to do is hook the sat feed into the input and hookup the 1&2 feeds to the 625?.i have the super dish they hooked up when locals became available in the northern il area and the hd dish for the voom package.also a dpp 44 switch.also im debating on turning in my purchased 921(549.00)to upgrade to the622.how much would my bill go up?.i currently have everthing but the kitchen sink and pay 124.98 a month.thanks!