Macro help, please!

I am trying to set up a macro that I can run every time I pull a certain spreadsheet. There are two columns with amounts, F and H. I need it to be be able to create a specific rule in conditional formatting each time so I decided to record a macro. If value in column F is less than H then I need it to highlight F. Is there a way in conditional formatting that you can do that without having to apply it to one row and then copy it down the remaining rows? If not, then here's my next question. How do I get the formatting to go to the last row without having to drag it down manually? Is there a way to automatically go to the last row? My data can change and i don't want to select a certain row and it eventually not include all rows. And I want to easily record a macro but my macro includes a specific row for the last number. This is my current macro with the conditional format mentioned above.

Moderator's note: Please take the time to review our rules. There aren't many, and they are all important. Rule #3 requires code tags. I have added them for you this time because you are a new member. --6StringJazzer

Selection.FormatConditions.Add Type:=xlExpression, Formula1:="=F2<H2"
    Selection.FormatConditions(Selection.FormatConditions.Count).SetFirstPriority
    With Selection.FormatConditions(1).Interior
        .PatternColorIndex = xlAutomatic
        .ThemeColor = xlThemeColorAccent2
        .TintAndShade = 0.399945066682943
    End With
    Selection.FormatConditions(1).StopIfTrue = True
    Selection.AutoFill Destination:=Range("F2:H41"), Type:=xlFillFormats
    Range("F2:H41").Select
    ActiveWindow.SmallScroll Down:=-36

Any help would be much appreciated!