Manually coding custom profile fields instead of using the array?

[LostForWords]

I'm trying to achieve an effect within my user CP with my custom profile fields.

I've realised I need to do this by manually writing the input code for each field as opposed to simply using the array.

I've tried a variety of codes and none seem to work, for example:

<input type="text" class="bginput" name="field3" value="" size="25" maxlength="250">

Now I find it hard to believe that it isn't possible to do this! Can anybody help me work out what exact code I'd need to write to make this work?