title: Select column and apply "General"-format to all cells + put macro on a button
body: <p>I am looking to do the following:</p>
  
  <ol>
  <li>When pressing a button, the Macro should be activated. </li>
  <li>The Macro selects Column H in Sheet 2 (same workbook). Not the whole column, just until data goes. The last line with data can be determined if after that line the next 10 lines are empty. </li>
  <li>For this selection, the "General" format is applied to every cell. </li>
  <li>After this, the same runs through for Column G. </li>
  <li>The Macro ends.</li>
  </ol>
  
  <p>I think it should be easily possible, but I am especially struggling with the "determining last line with data" part, as if applied to the whole column the PC massively slows down.</p>
  
  <p>Then, I am unsure where I should put the code (Sheet, ThisWorkbook, Module) as best practice.</p>