After cloning, you can treat the object just as if it was html already in the dom.
For example - html on your page:
<div id="cloneHere"></div>
<div class="well" id="buildInfoTemplate">
<form>
<fieldset>
<legend></legend>
<label></label>
<input type="text" placeholder="Type something…">
<span class="help-block">Example block-level help text here.</span>
<button class="btn">Save</button>
</fieldset>
</form>
</div>
Lets say you wanted to change the help-block text:
var template = $('#buildInfoTemplate').clone().removeAttr('id');
$('.help-block',template).html('hi there ryan');
$('#cloneHere').append(template);
And you'll get:
<div id="cloneHere">
<div class="well">
<form>
<fieldset>
<legend></legend>
<label></label>
<input type="text" placeholder="Type something…">
<span class="help-block">hi there ryan</span>
<button class="btn">Save</button>
</fieldset>
</form>
</div>
</div>