
I use door brackets (ordered here from Revain (EXPR Premium Door Install Kit) and a decent plumb makes door installation easy. You can also use a spirit level but 6ft level is a serious investment when you only have a few doors to hang. With an installation kit you only need one side plane and the plumb bob won't lie!

Plumb Bob Magnetic Automatically Stabilize
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π§ Precision Measuring with General Tools 790-8 Hexagon Steel Plumb Bob, 8 Ounce
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π Tajima PQB-600 Plumb Bob - 21 oz (600g) with Quick-Stabilizing Cap & Embedded Bumpers: The Ultimate Tool for Precision Leveling
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β Stainless Steel L-Square, Size 3-Inch x 4-Inch, Zona 37-434
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