This doesn't have to be done with a mallet or hammer, because this is removing wood from an edge and because of the orientation of the cut relative to the grain it can sometimes be done entirely using hand pressure, or by pressing on the end of the chisel handle with e.g. your shoulder, or youyour chin pressing on the back of your fist. But this will entirely depend on your chisel's overall length, the bevel angle, your sharpening level and, remember, the wood itself — hardness, grain orientation, whether the grain is plain or interlocked are all factors in the resistance it will put up.
A saw should be doing most of the work
Just like with forming dovetails, the chopping should be thea refinement process, not a creation process — the bulk of the shaping should have already been accomplished by sawing. How close to your layout lines you've sawn is a matter of individual skill and the saw being used, but I'd suggest aiming to have no more than 1mm (1/25") to chopshave away from the edges.
- Use the widest chisel available, if possible use one that's wider than the length of the bowtie 'arm'. This is one of the reasons I bought a 2" chisel first opportunity I had.
- Make sure whatever chisel you're working with is sharp sharp. And if it blunts during the process, stop and sharpen.
- Knife your layout lines rather than just using a pencil. Fine pencil lines are plenty accurate, but a chisel can't register into them the way it can into a knife line.
- Good lighting can make a huge difference; if you can't properly see what you're doing accuracy and speed can both suffer and good light is the first step.
- Consider getting some sort of vision aid. Doesn't have to be an OptiVisor or even one of its inexpensive clones, inexpensivecheap reading glasses are a bit of a secret weapon for this.
- If possible raise the workpiece up a little higher than your standard workbench height; over time your back will thank you. Note however that the higher you go the more you'll want to use a mallet/hammer.
If I can give you some cornerstone advice for where I think you are in your developmentwoodworking journey, practising sharpening is of absolute importance for the learner/developing hand-tool woodworker. Your process needs to give consistently good results, fairly effortlessly and, IMO quickly — while honing is not a race by any means, and speed isn't necessarily something to directly practice for, you do need to get to the point that stopping work to sharpen doesn't feel like too much effort3.
Stropping little and often (as carvers often do) is one good way to retain peak sharpness with almost zero time penalty, 'takingtaking you out of the'the zone' as any long, involved honingsharpening process — more than five minutes? — will tend to do.
StroppingFreehand stropping takes moments, literally 10 seconds or less; a quick hone on stones/diamond plates or honehoning + stropping should really take no more than three minutes all-in since there should be so little steel to remove.
2 Plus in a 'dense' practice mode like this you'll more easily pick up observations aboutnotice and retain how the grain of thea specific piece of wood you're working with can help or hinder you (compared with observations made weeks or months apart).