I have a 2008 Ford f450 6

I have a 2008 ford f450 6.4 powerstroke, I replaced the radiator this weekend and then when I was looking up how much coolant to add I found a few posts/sites that said u need to use a rad vac to bleed the air from the system. I don't have one obviously so I looked to see if u could bleed it the old way and I did find one person that said start and idle it for about 30 mins and add coolant as you go. That's how I've always done it in prior vehicles so I figure that this process will work. Am I right by assuming this? Like I said I just don't have the cash to be buying a $200 tool. Thanks in advance